JPH01175708A - Coil device - Google Patents

Abstract

PURPOSE:To eliminate winding operation of coil around core and to improve productivity by forming a magnetic material on a substrate which has a plurality of through holes, and by forming a plurality of conductors which are separated mutually across the magnetic material, and by forming a coil while electrically connecting the plurality of conductors through the through holes. CONSTITUTION:A magnetic material 13 is formed on the surface of a substrate 11 which has a plurality of through holes 12, a plurality of conductors 14 and 15 which are separated each other are formed across the magnetic material 13, and the plurality of conductors 14 and 15 are connected electrically through the through holes 12 to form a coil. For example, a paste where the magnetic material is mixed is printed and calcined on the substrate 11 where the through holes 12b, 12c, etc., are formed to form a ring-shape magnetic material 13. Then, copper is plated on both surfaces of the substrate 11, chemical etching is performed, conductors 14b and 15b and through hole electrodes A and B are formed, and the conductor 14b is connected to the conductor 15b through the hole electrode B and the conductor 15a through the through hole electrode A. Other conductors 14 and 15, terminal electrodes 16 and 17, etc., are formed by the same process.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coil device used in electronic equipment such as a television, and particularly to a toroidal coil device.

[Conventional technology]

Conventional examples are shown in Figs. 8 and 9. In Fig. 0, 5 is a ring-shaped core made of magnetic material such as ferrite, 6 is a ring-shaped core made of a magnetic material such as ferrite, and 6 is a ring-shaped core that is wound around the core 6, and the end is a lead terminal! , 2. 9th
The figure is an equivalent circuit diagram based on the configuration of FIG. 8.

Other conventional examples are shown in Figs. 10 and 11. In Fig. 0, 7 is a ring-shaped core made of a magnetic material such as ferrite, and 8 is a ring-shaped core made of a magnetic material such as ferrite. The first coil 9 is a second coil which is wound around the core 7 and has a lead terminal 3.4 at its end.

The first coil 8 and the second coil 9 form a transformer, and FIG. 11 is an equivalent circuit diagram thereof.

[Problem that the invention seeks to solve]

However, the above configuration has a problem in that since the core 5.7 is formed in a ring shape, it is difficult to wind the coil 6.8.9.

[Means for solving problems]

The present invention was proposed to solve the above problems, and involves forming a magnetic material on a substrate provided with a plurality of through holes, and forming a plurality of conductors separated from each other across the magnetic material. The present invention also provides a coil device in which a coil is formed by electrically connecting the plurality of conductors via the through holes.

[Function] The present invention eliminates the work of winding the coil around the core and improves production.

〔Example〕

Next, examples of the present invention will be described. Figures 1 to 3
The figure is a diagram showing a first embodiment of a coil device according to the present invention. In Fig. 1, 11 is a through hole 12 (12a, 1
2b, 12c...) are formed on a substrate made of a ceramic material such as alumina, 13 is a magnetic material made of a ferrite material formed in a ring shape on the surface of the substrate 11, and 14 (14a) is formed.
, 14b, 14c...) are conductors made of a metal material such as copper formed on the magnetic material 13, l5 (15a, 15b,
15c...) is a conductor made of a metal material such as copper formed on the back surface of the substrate 11, 16 is a terminal electrode electrically connected to one end of the conductor 14a of the conductor 14, and 17 is electrically connected to one end of the conductor 15g of the conductor 15. It is a terminal electrode. The conductor 14 and the conductor 15 are electrically connected through the through hole. For example, one end of the conductor 14b is electrically connected to the conductor 15a via a through-hole electrode formed in the through-hole 12b, and the conductor 14b
The other end is electrically connected to the conductor 15b via a through-hole electrode formed in the through-hole 12e. In this way, the conductor I4 and the conductor 15 are connected to the conductors 14a, 15a, 14b, 1
5b, 14c, and 15C are electrically connected in this order to form a coil, and serve as terminal electrodes 16 and 17 of the coil. The equivalent circuit based on this configuration is similar to that shown in FIG. 9 described above, and the symbols 1.2 in the figure correspond to the symbols 16 and 17 in FIG. 1, respectively.

Next, the main parts of the method for manufacturing the above-mentioned coil device will be explained as shown in FIG.
This will be explained using a cross-sectional view taken along line A'. First, Figure 2 (A)
A substrate 1 with through holes 12b and 12c formed as shown in FIG.
Prepare 1. Next, as shown in FIG. 2B, a paste mixed with a magnetic material is printed and fired on the substrate 11 to form a ring-shaped magnetic body 13.

Next, the front and back surfaces of the substrate 11 are plated with copper, and then chemically etched to form conductors 14b and 15b and through-hole electrodes A and B as shown in FIG. It is electrically connected to the conductor 15b via the through-hole electrode A, and to the conductor 15a via the through-hole electrode A. In this step, the manufacturing method of the coil device is completed, but conductors other than the above-mentioned conductors 14b and 15b (14a% 14C・-
, 15a, 15c=), terminal electrodes 16, 17, and other through-hole electrodes are also formed in the same process as conductors 14b, 15b and through-hole electrodes A and B.

3 and 4 are diagrams showing a second embodiment of the coil device according to the present invention. In FIG. 1, the same parts as in FIG. 1 are denoted by the same reference numerals, and the explanation thereof will be omitted. In FIG. 3, a conductor 9 is formed on the back surface of the substrate 11 from the through hole 12g, and a terminal electrode 18 is formed on the surface at the through hole 12p.The equivalent circuit is as shown in FIG. The configuration is such that the output is taken out from the middle of the coil. The manufacturing method is the same as that of the first embodiment described above, so the explanation will be omitted.

5 and 6 are diagrams showing a third embodiment of the coil device according to the present invention. In FIG. 0, the same parts as in FIG. In Figure 5, 22
(22a, 22b, 22c,...) are conductors formed on the front surface of the substrate 11, 23 (23a, 23b) are conductors formed on the back surface of the substrate 11, 24 (24a, 24b,
24c, 24e, 24f, 24g) are through holes, 2
0.21 is a terminal electrode. The conductors 22 and 23 are electrically connected via through-hole electrodes formed in the through-holes 24 (24a to 24e) to form a coil, and the terminal electrodes 20.21 connect the conductors formed on the back surface of the substrate 11. The zero equivalent circuit formed on the surface via the through-hole electrodes formed in the through-holes 24f and 24g forms a transformer as shown in FIG. The manufacturing method is the same as that of the first embodiment described above, so the explanation will be omitted.

FIG. 7 is a diagram showing a fourth embodiment of coil manufacturing according to the present invention. In the figure, the same parts as in FIG. 2 are given the same reference numerals, and their explanations will be omitted. In FIG. 7, 25 is a magnetic body made of a magnetic material such as ferrite. In this embodiment, the magnetic material 25 is also formed on the back surface of the substrate 11, and this structure improves the characteristics of the coil.This embodiment is similar to the first, second, and third embodiments described above. It can be applied to

In addition, although the above embodiments are all single coil devices,
This coil device is formed using thick film or thin film technology, and therefore may be formed on a large substrate together with other circuit elements or wiring, in which case the work of attaching the coil device to the substrate is becomes unnecessary.

〔Effect of the invention〕

As described above, the coil device of the present invention includes forming a magnetic material on a substrate provided with a plurality of through holes, forming a plurality of conductors separated from each other and crossing over the magnetic material, and forming a plurality of conductors separated from each other. Since the coil is formed by electrically connecting the core through the through hole, there is no need to wind the coil around the core as in the past, making it easier to form the coil and improving productivity. Since it can be formed on the substrate together with other circuit elements or wiring parts by thick film or plating technology, it has the advantage of eliminating the need to attach the coil to the substrate.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the coil device according to the present invention, FIG. 1 is a front view, FIG. 2 is a diagram showing the manufacturing process,
3 and 4 show a second embodiment of the coil device according to the present invention, FIG. 3 is a front view, FIG. 4 is an equivalent circuit diagram, and FIGS. 5 and 6 are coils according to the present invention. A third embodiment of the device is shown, FIG. 5 is a front view, FIG. 6 is an equivalent circuit diagram, FIG. 7 is a sectional view showing a fourth embodiment of the coil device according to the present invention, and FIGS. The figure shows a conventional coil device, FIG. 8 is a front view,
FIG. 9 is an equivalent circuit diagram, FIGS. 10 and 11 show other conventional coil devices, FIG. 10 is a front view, and FIG. 11 is an equivalent circuit diagram. 11... Substrate 12 (12a, 12b, 12c, 12g-12p), 24 (24a, 24b, 24c, 24e124'', 2
4g)...Through hole 5.7...Core 13...Magnetic body 14 (12a, 12b, 12c), 1
5 (15a, 15b, 15c), l
9, 22 (22a, 22b, 22c)
, 23 (23a, 23b) ... Conductor 1
6.17.18.20.21...Terminal electrode Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 5 16 20 2+ 17 Fig. 6

Claims (1)

[Claims] A magnetic material is formed on the surface of a substrate provided with a plurality of through holes, a plurality of conductors are formed across the magnetic material and separated from each other, and the plurality of conductors are electrically connected through the through holes. A coil device characterized by being connected to form a coil.