JPH08130115A - Electronic chip component - Google Patents

Abstract

PURPOSE: To provide an efficient electronic chip component wherein a current capacity of conductors can be increased and conductor resistance values can be reduced without increasing the printing thickness or expanding the printing width. CONSTITUTION: In an electronic chip component wherein patterns P1-Pn are formed on magnetic sheets 1, 2-n to form current channels C1, C2-Cn and one end of one current channel is connected to one end of another current channel in sequence and thereby a spiral coil is formed, the current channels C1, C2-Cn are made by laminating the magnetic sheet 1, 2-n on which the same patterns P1, P1-Pn, Pn are formed in at least two layers and connecting the magnetic sheets 1, 2-n in parallel. The current channels C1, C2-Cn can be made also by parallelly connecting the same patterns P1, P1-Pn, Pn to each other by means of through holes or overprinting the patterns.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic chip component such as a laminated chip transformer or a laminated chip inductor used in various electronic devices.

[0002]

2. Description of the Related Art Conventionally, it has been difficult to increase the current capacity of a conductor in this type of electronic chip component characterized by its small size and thin shape, but in recent years, a lithium battery or the like has been used as a driving power source. The number of low-voltage drive type chip components tends to increase, and in order to cope with this, it is necessary to compensate for the amount of voltage drop by an increase in current. Therefore, it is necessary to increase the current capacity of the chip components.

When a circuit pattern of such an electronic chip component is produced by pattern printing (screen printing), the printed thickness (conductor thickness) is increased to increase the current capacity.
Alternatively, a method of increasing the print width (pattern width) can be considered.

[0004]

However, in the method of increasing the printing thickness, there is a problem of pattern accuracy, and there is a risk that cracks and deformation may occur during lamination pressure bonding and sintering due to a gap between the thickness of the conductor portion and the non-conductor portion. For this reason, the thickness of the conductor is limited to 20 to 30 μm, and it is difficult to increase the printing thickness further.

Also, in the method of widening the printing width, the area of the conductor portion is considerably larger than the area of the magnetic path, which makes it difficult to reduce the size. In the case where there is a secondary winding, magnetic flux is generated in the conductor. There is also a problem that the conductor loss increases due to the crossing.

An object of the present invention is to solve the above problems and to provide an efficient electronic chip component capable of increasing the current capacity of a conductor and reducing the conductor resistance without increasing the print thickness or the print width. Is to provide.

[0007]

That is, in the present invention, the patterns (P1 to Pn) are formed on the magnetic sheets (1, 2 to n) to form the current paths (C1, C2 to Cn), and In an electronic chip component in which one end of a current path is sequentially connected to one end of another current path to form a winding coil, the current paths (C1, C2 to Cn) have the same pattern (P1, P1 to
Pn, Pn) -formed magnetic sheets (1, 2 to n) were laminated at least two or more and they were connected in parallel.

Further, in the present invention, the current paths (C1, C2 to C).
n) is formed by connecting the same patterns (P1, P1 to Pn, Pn) in parallel through through holes.

Further, in the present invention, the current paths (C1, C2 to C).
n) was formed by connecting the same patterns (P1, P1 to Pn, Pn) in parallel by printing overprinting.

[0010]

[Operation] With the above-described structure, in the present invention, the currents are divided into parallel-connected patterns and thus flow in small amounts, but the current capacities can be increased as a whole.

Further, since the current path is subdivided into a plurality of identical patterns, the influence of the skin effect at high frequencies is reduced,
The current flows efficiently and the conductor loss is reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the arrangement of magnetic sheets when a choke type chip transformer used in a DC-DC converter or the like is manufactured by applying the present invention.

This is a conductor (for example, silver) after sintering.
The basic pattern P shown in FIG. 2 having a thickness of 20 μm and a width of 1 mm is screen-printed on a magnetic material green sheet, and the pattern P on the magnetic sheet is arranged so that the pattern P turns around in sequence. .

In this embodiment, a total of eight kinds of patterns formed on the magnetic sheets 1 to 16 are sequentially laminated to form a winding coil having 6 turns. However, in order to increase the current capacity of the conductor, the same pattern is used. Two pieces are superposed on each other, and the connections between the respective patterns P1 to P8 are all through-hole connections as shown by the dotted lines in the figure.

For connection, first of all, the same pattern of the above-mentioned two pieces is connected to both open ends thereof (however, upper and lower electrode portions E to be described later).
Are connected together in parallel by short-circuiting with a through hole to form current paths C1 to C8 for dividing the current. Then, one end of the open end of the formed current path (for example, C1) is connected to one end of another similarly formed current path (for example, C2), and eight different kinds of current paths C1 to C are similarly formed.
8 are connected in a loop to form a series of orbiting coils.
The upper and lower magnetic sheets 1, 2 and 15, 16 are printed with an electrode portion E serving as a terminal for power feeding. The magnetic sheets 1 to 16 thus laminated are laminated and crimped by a hot press together with magnetic sheets S1 and S2 (each having a plurality of sheets so that a required magnetic path cross-sectional area can be obtained) on which nothing is printed. Then, it is further fired to manufacture a choke type chip transformer T as shown in FIG.

For the sake of explanation, it has been stated that the winding coils are produced one by one, but in reality, a plurality of winding coils are produced at the same time, laminated, pressure-bonded, separated, and fired to obtain a product.

Further, as an application example of this, by printing a plurality of conductor patterns Pa and Pb as shown in FIG. 4 on a magnetic material sheet, it is possible to manufacture an insulation type transformer and a multi-output type transformer. .

FIG. 5 shows another embodiment of the present invention.

In the present embodiment, the same pattern is applied twice each to form a current path, and in the same manner, a total of five types of patterns P1 to P5 are applied so as to sequentially circulate (current paths C1 to C5). C5 is formed) to form a winding coil having three and a half turns.

That is, in the first step, the first pattern P1 is printed on the magnetic substrate S (step), ferrite printing for insulation is performed (step), and then the same pattern P1 is printed again on this. (Step), after further performing ferrite printing for insulation (step), printing another pattern P2 on it (step) is repeated 5 times in total.
Patterns P1 to P5 of different types are sequentially printed. At this time, since the same patterns are connected in parallel and are further connected so as to circulate, in the above-mentioned ferrite printing,
The connecting portion between the patterns was painted out in a window shape (a rectangular frame in the figure) to expose the conductor portion, so that the conductor portion was connected during overcoating. The connection form is the same as that of the through hole connection described above. After the final pattern P5 is printed, the entire surface is printed with ferrite to form a circulating magnetic circuit.

In the above-described two embodiments, two identical patterns are connected in parallel. However, if the number of parallel connections is increased, more current can flow and the current capacity can be further increased. You can According to such a method, the current flowing through one pattern can be small, so that it is not necessary to increase the printing thickness or the printing width, and it is possible to manufacture a small and highly reliable chip transformer. Becomes

[0022]

As described above, according to the present invention, a pattern is formed on a magnetic sheet to form a current path, and one end of the current path is sequentially connected to one end of another current path to form a winding coil. In the electronic chip component formed by forming at least two magnetic sheets having the same pattern, the current paths are formed by stacking the magnetic sheets in parallel and connecting them in parallel. However, it is possible to increase the current capacity as a whole. As a result, there is no need to increase the pattern thickness or the pattern width as in the conventional case, and it is possible to reduce the size and thickness of electronic chip components such as a chip transformer and a chip inductor.

Further, the current path is subdivided into a plurality of identical patterns to reduce the influence of the skin effect at high frequencies, and the performance of the parts is improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an example in which the present invention is applied to the manufacture of a chip transformer.

FIG. 2 is a diagram showing a basic pattern for forming a spiral coil.

FIG. 3 is a diagram showing an outline of a choke type chip transformer,
(a) is an external perspective view, (b) is an AA cross section.

FIG. 4 is a diagram showing a basic pattern for forming a winding coil different from that of FIG. 2;

FIG. 5 is a diagram showing another embodiment different from FIG.

[Explanation of symbols]

 1, 2 to n Magnetic sheet C1, C2 to Cn Current path P1, P1 to Pn, Pn pattern

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takafumi Ito 5-36-1 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd. (72) Inventor Masahiro Iguchi 5-36-11 Shinbashi, Minato-ku, Tokyo Fuji Electrochemical Co., Ltd.

Claims (3)

[Claims] 1. A current path (C1, C2-Cn) formed by forming a pattern (P1-Pn) on a magnetic sheet (1,2-n).
) Is formed and one end of the current path is sequentially connected to one end of another current path to form a winding coil. In the laminated chip transformer or inductor component, the current paths (C1, C2 to Cn) are the same. Pattern (P
1, P1 to Pn, Pn) -formed magnetic sheets (1, 2)
To n) are laminated at least two and are connected in parallel to each other to form a laminated chip transformer or inductor component. 2. The current paths (C1, C2 to Cn) are formed by connecting the same patterns (P1, P1 to Pn, Pn) in parallel by through holes.
Electronic chip parts described. 3. The electron according to claim 1, wherein the current paths (C1, C2 to Cn) are formed by connecting the same patterns (P1, P1 to Pn, Pn) in parallel by overprinting. Chip parts.