JPH02101714A - Chip type inductance element and manufacture thereof - Google Patents

Abstract

PURPOSE:To simplify structure and to improve massproductivity by laying magnetic substance green sheets having a U-shaped conductor line on top of the other, and electrically connecting the conductor lines of each layer from outside after or before baking so as to form a coil. CONSTITUTION:A U-shaped conductor line 2 is formed using silver paste, etc., on a magnetic substance green sheet 1 by screen printing, etc. Though a plurality of such green sheets are laminated, a green sheet whereon a conductor line 3' to take out an electrode to the opposite side of a laminate is printed is put on the top, and for the others only the green sheets having the U-shaped conductor lines 2 are laminated, and only on the top of the laminate or on the top and below the bottom green sheets 4 without conductor lines are laid for the purpose of insulation. The one Which is formed by pressing laminated green sheet so as to force-bond each green sheet is put in a baking furnace for baking, and after baking U-shaped conductor lines are connected electrically whereby a coil is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a chip-type inductance element used in various electronic circuits and a method for manufacturing the same.

<Prior Art> In recent years, with the miniaturization, higher integration, and higher frequency of electronic circuits, there has been an increasing demand for small, surface-mountable chip-type inductance elements.

Conventionally, this type of inductance element is formed by forming electrodes on a substrate that holds a magnetic core, wrapping a conductor around the magnetic core, and connecting the ends of this conductor to electrodes on the substrate. Wire-wound inductance elements, or laminated inductance elements formed by alternately printing magnetic green sheets and conductors and connecting the conductors of each layer as described in Japanese Patent Publication No. 57-39521, etc. Commonly used.

<Problems to be Solved by the Invention> Conventional inductance elements as described above, both of wire-wound type and laminated type, have a problem that their structure and manufacturing process are complicated, making them less suitable for mass production, and resulting in high manufacturing costs. There is.

In view of the above-mentioned problems, this invention was made to improve the shortcomings of conventional chip-type inductance elements. The objective is to provide a manufacturing method.

Means for Solving the Problems> This invention was made to solve the above problems, and consists of overlapping a magnetic green sheet with a U-shaped conductor line formed thereon, and after firing, forming a U-shaped conductor line. This is a chip-type inductance element in which a coil is formed by electrically connecting conductor lines.

In addition, U-shaped conductor lines are printed on green sheets, and after multiple green sheets are stacked and fired, the ends of the U-shaped conductor lines exposed to the outside are electrically connected between the upper and lower layers. The present invention provides a method for manufacturing a chip-type inductance element in which a coil made of a conductor line is formed by printing a conductor as shown in the figure, and both ends of the coil are connected to external electrodes.

Furthermore, a U-shaped conductor line is printed on a magnetic green sheet, a plurality of these green sheets are overlapped, and the ends of the U-shaped conductor line exposed to the outside are electrically connected between the upper and lower layers. A coil consisting of a conductor line is formed by printing a conductor as shown in FIG. A terminal is provided at one end of the coil for conduction using a conductor in a through hole provided in the laminate, and the other terminal is connected to a conductor passing through the inside of the laminate from the side opposite to the side where the backing plate is stacked. To provide a method for manufacturing a chip-type inductance element, in which a chip-type inductance element is fired, which is taken out through a laminate, and caps made of a conductor are placed on both ends of the fired laminate, and each terminal and the cap are electrically connected.

<Embodiments> Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 8 of the accompanying drawings.

First, as shown in FIG. 1, a U-shaped conductor line 2 is formed on a magnetic green sheet 1 by a method such as screen printing using silver paste or the like.

A plurality of such green sheets 1 are laminated, and in the first embodiment shown in FIGS. 2 and 3, a green sheet is printed with a conductor line 3' printed on the top surface for taking out an electrode on the opposite side of the laminate. A sheet 3 is placed thereon, and only the green sheets 1 having U-shaped conductor lines 2 are laminated.

Then, green sheets 4 having no conductor lines are stacked on only the upper surface of the laminate, or on the upper and lower surfaces, for the purpose of insulation.

In addition, in the second embodiment shown in FIGS. 4 and 5, a green sheet 3 with a conductor line 3' printed on the top surface for taking out the electrode on the opposite side of the laminate is placed, and a conductor line is placed below it. Green sheets 4 with no U-shaped conductor lines 2 and green sheets 1 with U-shaped conductor lines 2 are alternately laminated.

In this case as well, a green sheet 4 without conductor lines is placed only on the upper surface of the laminate, or on both the upper and lower surfaces, for the purpose of insulation. In each of these embodiments, the conductor line 3'
penetrates the inside of the laminate.

As in the first and second embodiments described above, the stacked green sheets are pressurized so that each green sheet is crimped and then charged into a firing furnace and fired to form a sintered body A.

FIG. 6 shows one end surface of the sintered body A of the second embodiment, that is,
A conductor line 5 is formed by printing with silver paste or the like on the surface where the end of the U-shaped conductor line 2 is exposed, and the conductor line 2.
5 and the conductor line 3' on the green sheet 3 are shown in a continuous coiled state, and one end of the U-shaped conductor line 2 at the bottom thereof is provided with a lead-out electrode 6 made of silver paste or the like.

Further, on the other side of the sintered body A, as shown in FIG. An electrode 7 for extraction is also provided at the end of the electrode 7 using silver paste or the like.

On the other hand, a patch plate 8 made of another magnetic material or an insulator with through holes 9 provided in the corners is prepared, and this is applied to the surface of the sintered body A having the conductor line 5. The coil is stacked and crimped onto the sintered body A so that the hole 9 is in electrical contact with the electrode 6 at one end of the coil, fixed with adhesive, etc., and one end of the coil is exposed to the outside through the through hole 9. Take it out.

Regarding the formation of conductor lines and extraction electrodes at the ends of the sintered body in the case of the first embodiment, explanations will be omitted, but there is no difference from that shown in Figs. 6 and 7. .

Finally, metal caps 10 are placed over both ends of the sintered body A as shown in FIG.
electrically connected to.

In the above process, before each green sheet is sintered, a caul plate 8 may be applied and fired together with the green sheet.

<Effects of the Invention> For the above purpose, the present invention overlaps magnetic green sheets having U-shaped conductor lines, and after or before firing, electrically connects the conductor lines of each layer from the outside to form a coil. The structure is simpler and easier to mass produce than conventional inductance elements. Therefore, a chip-type inductance element can be provided at low cost.

Further, a sintered body obtained by stacking magnetic green sheets, electrically connecting the conductor lines of each layer, and then covering the sintered body with a cap made of metal or the like can be directly surface-mounted on a printed circuit board.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a magnetic green sheet, and Figure 2 is a perspective view of a magnetic green sheet.
3 is a perspective view of the same laminated state as above, FIG. 4 is a perspective view of each green sheet of the second embodiment before lamination, and FIG. 5 is a perspective view of each green sheet before lamination in the second embodiment. FIG. 6 is a perspective view of the laminated state of the same as above, FIG. FIG. 8 is a partially cutaway perspective view of the laminate shown in the figure from the opposite direction, and FIG. 8 is a sectional view of the completed product. 1.3.4...Magnetic green sheet 2.3', 5.
・・Conductor line 6.7・・Electrode for extraction 8・・Backing plate 9・・Through hole 10・・Cap

Claims (3)

[Claims] (1) A chip-type inductance element in which a U-shaped conductor line formed on a magnetic green sheet is stacked, and after firing, a coil is formed by electrically connecting each end of the U-shaped conductor line. (2) After printing a U-shaped conductor line on a magnetic green sheet, stacking multiple green sheets and firing them, the ends of the U-shaped conductor line exposed to the outside are electrically connected between the upper and lower layers. A method for manufacturing a chip-type inductance element, in which a coil is formed from a conductor line by printing a conductor so as to be connected to the coil, and both ends of the coil are connected to external electrodes. (3) Print a U-shaped conductor line on a magnetic green sheet, overlap multiple green sheets, and connect the ends of the U-shaped conductor line exposed to the outside electrically between the upper and lower layers. A coil consisting of a conductor line is formed by printing a conductor as shown in FIG. A terminal is connected to one end of the coil by means of a conductor in a through hole provided in the laminate, and the other terminal is connected to a conductor passing through the inside of the laminate from the side opposite to the side where the backing plate is stacked. A method for manufacturing a chip-type inductance element, which comprises firing a laminate that is taken out through the laminate, covering both ends of the fired laminate with a cap made of a conductor, and electrically connecting each terminal with the cap.