JPH0442905A - Chip type lc composite component and its manufacture - Google Patents

Abstract

PURPOSE:To enable structure to be simple and mass-productivity to be improved by providing a toroidal coil shaped pattern on a surface of a ring-shaped magnetic body in lamination structure. CONSTITUTION:First, for producing a coil part 40, rectangular ring shaped magnetic body green sheets 1a, 1b, 1c and 1d are prepared. Conductor lines 2, 3, and 4 are formed so that they are interlockingly connected when the sheets 1a - 1d are laminated. Then, a laminate is produced by laminating the sheets 1a - 1d where the conductor line is formed. At this time, interlockingly connected three-winding toroidal coil shaped pattern is formed. The laminate is set to a press machine, is subjected to press, and green sheets 1a - 1d are subjected to contact bonding. These are put into a firing furnace and is subjected to firing treatment in one piece at a specified firing temperature and for a specified amount of time for obtaining a coil part 40. Then, a capacitor part 41, namely a dielectric substrate 42, where capacity electrodes 43a, 43b are provided on upper and lower surfaces using a silver paste etc., is built into a hole 39 of the coil part 40.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a chip-type LC composite component used in various i-chip circuits and a method for manufacturing the same.

BACKGROUND TECHNOLOGY AND PROBLEMS Conventionally, as this type of LC composite component, a hybrid LC composite component is known, which is manufactured by arranging and bonding a coil and a capacitor on a substrate, and then molding with resin or the like. Alternatively, a laminated LC composite is created by overlapping a coil part formed by alternately printing a magnetic material and a spiral conductor pattern and a capacitor part formed by alternately printing a dielectric material and a capacitive electrode. Parts are known.

By the way, these conventional chip-type LC composite parts, both of the hybrid type and the laminated type, have a problem in that their structure and manufacturing process are complicated, poor in mass production, and manufacturing cost is high.

Therefore, the object of the present invention is to have a simple structure, excellent mass productivity, and
Furthermore, it is an object of the present invention to provide a chip-type LC composite component that is inexpensive to manufacture and a method for manufacturing the same.

In order to solve problems beyond those described above, we have developed a chip-type LC according to the present invention.
The composite part includes: (a) a coil part in which ring-shaped magnetic sheets with conductor lines formed on the surface are laminated, and the conductor lines are connected at the outer peripheral edge and hole edge of each sheet to form a toroidal coil pattern; (b) a capacitor part made of a dielectric and a capacitor electrode and incorporated into a hole formed in the coil part; (C) a toroidal coil pattern of the coil part and a capacitor electrode of the capacitor part; and are electrically connected. With the above configuration, the toroidal coil pattern is disposed on the surface of the ring-shaped magnetic body of the laminated structure, so when a current flows through the toroidal coil pattern, most of the generated magnetic flux is inside the ring-shaped magnetic body. Through this, the same function as a so-called normal cored toroidal coil is exhibited. Furthermore, since the capacitor section is assembled into the hole formed in the coil section, there is no risk that the dimensions of the component will increase due to the capacitor section.

Further, the method for manufacturing a chip-type LC composite component according to the present invention includes the steps of (d) forming a conductor line on the surface of a ring-shaped magnetic green sheet; and (e) laminating the sheets and forming an outer peripheral edge of each sheet. forming a coil section having a toroidal coil pattern on its surface by connecting the conductor lines at the hole edge and the hole edge; After assembling the capacitor part, the coil part incorporating the capacitor part is sandwiched between protection plates provided with connection lines on the surface to assemble the coil part integrally, and the toroidal coil pattern and the capacitance electrode are electrically connected by the connection line. (g) providing an external electrode connected to at least one of the toroidal coil pattern and the capacitive electrode on the surface of the assembly.

According to this method, the work of forming a conductor track on the surface of a ring-shaped magnetic green sheet can be carried out independently and in parallel for each sheet, so unlike conventional laminated LC composite parts, the magnetic material and conductor pattern can be formed on the surface of the ring-shaped magnetic green sheet. There is no need to stack up the layers one after another, which shortens the process period and simplifies the manufacturing process. In addition, it can be easily assembled by sandwiching the coil part incorporating the capacitor part between the protection plates, and at the same time, the toroidal coil pattern and the capacitive electrode are electrically connected by the connection line provided on the surface of the protection plate. .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, one embodiment of a chip-type LC composite component and a method for manufacturing the same according to the present invention will be described with reference to the accompanying drawings. In this example, the number of turns of the toroidal coil pattern is L, which is 3 turns.
The C composite component will be explained, and by changing the width, formation position, and number of conductor lines, a desired number of turns can be obtained.

First, in order to manufacture the coil part 40, as shown in FIG. 1, a rectangular ring-shaped magnetic green sheet la is prepared.

Ib, Ic, and ld are prepared. These magnetic sheets la to 1d are made by kneading ferrite magnetic powder mainly composed of Fe, O, etc. with a binder, a solvent, etc., making it into a paste, and forming it into a thin sheet with a thickness of ten to several tens of μm. This is what I did. Rectangular holes IA, IB, IC, and ID are formed in the center of the sheets 18 to 1d by punching or the like.

Next, conductor lines 2, 3, and 4°51i are formed on the upper and lower surfaces of the sheet 1a, the outer peripheral end surface, and the hole wall surface using a method such as screen printing using silver paste or the like. Conductor line 2 is Sea I.
It is formed on the lower surface of the right front side of 1v, and one end is sea)-
It extends to the outer circumferential end surface of the right front side of the hole IA to form an extraction electrode 2n, and the other terminal end 2b wraps around from the right front side wall surface of the hole IA to the upper surface at A7. Each 3 conductor wires P are formed on the lower surface of the front side near the center left side of the sheet hla, and one terminal shaft is connected to the sheet 1a.
The other terminal end 3b wraps around from the outer peripheral end surface on the front side of the center left side to the upper surface, and the other terminal end 3b wraps around from the left front @ wall surface of hole 1Δ to the upper surface.
I'm 7. The conductor line 4 is formed on the bottom surface of the left rear side of the sea 1-1a, and has one terminal end 4a1. It wraps around from the outer peripheral end surface of the center left side of sheet 1a to the top surface, and the other end @4N)
wraps around from the back left wall of hole IA to the upper surface. The conductor line 5 is formed on the bottom surface of the back right side of the sea)
The terminal end 5a of the sheet 1a wraps around the upper surface from the outer circumferential end surface on the inner right side of the center right side of the sheet 1a, and the other terminal end extends to the outer circumferential end surface on the right inner side of the sheet hla, forming an extraction electrode 5b.

Similarly, sheet 1. b. Conductor lines are formed on le and ld. Conductor lines 12.14.
[is formed on the wall of hole IB, and each conductor line 1.2.
iii. The inner end of 16 wraps around the second or lower surface of sheet 1b.

Conductor lines 13, 15, 17 are formed on the outer peripheral end surface of the sheet 1b, and the inner end of each conductor line 13, 15, 17 wraps around the upper or lower surface of the sheet 1b at A7. C!
・] Conductor lines 22, 24, 26 are formed on the wall of the hole IC of C in the shape y, and the outer peripheral end surface (,
7 is formed.

The inner ends of each of the conductor lines 22 to 27 wrap around the two or lower surfaces of the IC. Furthermore, conductor lines 32, 33, 34 are formed on the upper surface of the sheet 1d, and the inner ends of each conductor line 32, 33, 34 wrap around from the hole wall surface of the hole ID and the outer peripheral end surface of the sheet 1-1d to the lower surface. There is. At this time, the conductor lines 2, 3, 4, etc. are formed so as to be connected when the sheets 1a to 1d are formed into the shape M. For example, the conductor line 12 formed on the sheet 1b is the conductor line 2
It is formed at a position aligned with the terminal end 2b of. Further, the conductor line 13 is formed at a position shifted to the right with respect to the terminal axis of the conductor line 3. Here, since the work of forming conductor lines 2, 3, 4, etc. on the surface of each sheet 1a to 1d can be performed independently and in parallel for each sheet, it is possible to perform the work of forming conductor lines 2, 3, 4, etc. on the surface of each sheet 1a to 1d, so that it is possible to perform the work of forming conductor lines 2, 3, 4, etc. on the surface of each sheet 1a to 1d independently and in parallel. There is no need to stack the conductor bars one after another, and the manufacturing process is simplified and the period of time is reduced by T.

Next, a laminate is produced by stacking the conductor lines formed thereon. At this time, the terminal end 2b of the conductor line 2 formed on the sheet 1a is connected to the conductor line 2 formed on the sheet 1b stacked above it, and the conductor line 12-22 is successively connected to the conductor line 2 formed on the sheet 1a. -32-2313-
3-14-24-3.3-2515-4-16-26-
3427-17-5 to form a three-turn toroidal coil pattern.

In this way, a three-turn toroidal coil-like pattern is arranged on the surface of the laminate, and the inner ends are the lead-out t-poles 2a and 5a of the conductor lines 2 and 5 formed on the sheet 1a.
becomes. On the other hand, See!・The holes IA to ID of 1a to 1d are '
: The hole 39 is located at the center of the coil portion 40 (see Fig. 2, 8). The laminate is placed in a press and then pressurized, and each green sheet (1a-1d) is pressed. After being crimped in this manner, the resulting material is put into a firing furnace and fired integrally at a predetermined firing temperature and time to obtain the coil portion 40.

Next, as shown in FIG. 2, a capacitor section 41, that is, a dielectric substrate 42 having capacitance electrodes 43a and 43b provided on the upper and lower surfaces using silver paste or the like is assembled into the hole 39 of the coil section 40. The capacitive electrodes 43a and 43b are provided slightly inward from the outer edge so as not to make electrical contact with the toroidal coil patterns (2, 3, etc.).

Protective plates 45 and 50 are bonded with adhesive to the upper and lower surfaces of the coil section 40 in which the condenser section 41 is incorporated. A connection line 46 is provided on the lower surface of the protection plate 45, and both ends 46a,
46b are respectively connected to the capacitor electrode 43a and the conductor line 33 via conductive paint or the like. A conductive pattern 51 is provided on the upper surface of the protective plate 50, and the −f end 51
1.a through the capacitive electrode 43b and conductive paint, etc. The other end 51b extends to the outer peripheral end surface on the left front side of the protection plate 50 and is connected to the drawer 1. [Pole 51b is 1°. The protective plates 45 and 50 may be made of a magnetic material, or may be made of a dielectric material depending on the case.

The assembly 56 thus obtained is, as shown in FIG.
Conductor line 2.5 and lead electrode 2a of conductor pattern 51
, 5b, and 51b, and cover the conductor lines 3, 13, 23, 32, etc. extending on the outer peripheral end face with an insulating material.

As the insulating material, for example, a paste made of glass powder and a binder, or a paste made of powder such as alumina is used, and the material is applied to the outer peripheral end surface of the assembly 56 by means such as dipping or printing and baked. Further, on the surface of the assembly 56, extraction electrodes 2a, 5b, 51
external electrodes A respectively connected to b.

B and C are formed. The external electrodes A, B, and C may be formed using a metal cap, or may be formed by applying a silver paste or the like and then firing it. In this way, a chip-type LC composite component that can be surface mounted on a printed wiring board or the like is obtained.

In the resulting chip-type LC composite component, when current flows through the toroidal coil pattern, most of the generated magnetic flux passes through the ring-shaped magnetic material of the laminated structure, exhibiting the same function as a normal cored toroidal coil. do. Moreover, in order to incorporate the capacitor part 41 into the hole 39 of the coil part 40,
FIG. 4 shows an equivalent electrical circuit diagram of the obtained chip-type LC composite component, in which there is no possibility that the component size will increase due to the capacitor portion 41. The toroidal coil pattern has two inductances L1. These inductances LL and L2 are the external electrodes A.

8 are connected in series. Further, a capacitor electrode 4 electrically connected to the conductor line 33 via a connection line 46
3a and a capacitor electrode 43b electrically connected to the external electrode C via the conductor pattern 51, forming a capacitor C1.

Note that the chip-type LC composite component and the manufacturing method thereof according to the present invention are not limited to the above embodiments, and can be modified in various ways within the scope of the gist.

In the above embodiment, a T-shaped LC composite component has been described, but an L-shaped or π-shaped LC composite component can also be constructed by changing the connection points between the coil section and the capacitor section.

Furthermore, after the unfired coil part, capacitor part, and protection plate are crimped together, they may be fired simultaneously to form an LC composite component.

Furthermore, a finished product such as a multilayer ceramic capacitor in which a large number of capacitive electrodes are stacked may be used as the capacitor section.

Effects of the Invention As described above, according to the present invention, a toroidal coil pattern is disposed on the surface of the ring-shaped magnetic body of the laminated structure, so when a current flows through this toroidal coil pattern, the generated magnetic flux is Most of the coil passes through the inside of the ring-shaped magnetic body, exhibits the same function as a so-called normal cored toroidal coil, and provides a chip-type LC composite component with a simple structure.

Furthermore, since the capacitor section is incorporated into the hole formed in the coil section, it is possible to reduce the size of the component.

Furthermore, when manufacturing the LC composite component according to the present invention, if a conductor track is formed on the surface of a ring-shaped magnetic green sheet and then the sheets are laminated and integrally fired, the conductor track can be formed on the surface of the magnetic green sheet. The forming work can be carried out independently and in parallel for each sheet, eliminating the need to stack magnetic materials and conductor patterns one after another as in conventional laminated LC composite parts, and the capacitor part can be incorporated using a protective plate. The parts can be easily assembled by sandwiching the coil part, and at the same time, the connection line provided on the surface of the protection plate electrically connects the capacitor electrode of the capacitor part, which shortens the process time. Chip type L with simplified manufacturing process, excellent mass production, and low manufacturing cost
C composite parts are obtained.

[Brief Description of the Drawings] Figures 1 to 4 show an embodiment of the chip-type LC composite component and its manufacturing method according to the present invention. The figure is an exploded perspective view of the LC composite part, FIG. 3 is a perspective view of the completed product, and FIG. 4 is its equivalent electrical circuit diagram. 1a+ 1b+ lc, ld...ring-shaped magnetic green sheet, 2, 3, 4, 5.12.13.14
．． 15.16, 17.22.23.24.25.26゜27, 32.33.34... Conductor line, 39... Hole, 40... Coil part, 41... Capacitor part, 42
...dielectric substrate, 43a, 43b...capacitance electrode,
45.50...Protection plate, 46...Connection line, 56.
...Assembly, A, B, C...External electrode, ■, 1. L2
...Inductance, CI...Capacitor. Patent applicant Murata Manufacturing Co., Ltd.

Claims (2)

[Claims] 1. A coil section in which ring-shaped magnetic sheets with conductor lines formed on the surface are laminated, and the conductor lines are connected at the outer periphery and hole edge of each sheet to form a toroidal coil pattern, and a dielectric and a capacitive electrode. and a capacitor part incorporated in a hole formed in the coil part, and a toroidal coil pattern of the coil part and a capacitive electrode of the capacitor part are electrically connected. Chip type LC composite parts. 2. forming a conductor line on the surface of a ring-shaped magnetic green sheet; stacking the sheets and connecting the conductor lines at the outer periphery and hole edge of each sheet to form a toroidal coil pattern on the surface; Step of forming a coil part; After incorporating a capacitor part made of a dielectric material and a capacitive electrode into a hole formed in the coil part, the coil part with the capacitor part assembled therein is placed between a protection plate having a connection line on its surface. a step of sandwiching and assembling the toroidal coil pattern and the capacitive electrode electrically through the connection line; and a step of connecting the external electrode to at least either the toroidal coil pattern or the capacitive electrode. A method for manufacturing a chip-type LC composite component, comprising: a step of providing it on the surface of an assembly.