KR0125882B1 - Manufacturing method of chip transformer - Google Patents

Abstract

The present invention provides a method of manufacturing a chip-shaped transformer used in various electronic circuits capable of surface mounting a transformer consisting of two coils.

In the method of manufacturing a chip-shaped transformer of the present invention, the leading position of the inner electrode pattern is printed so that the lead positions of the inner electrode patterns are different from each other in the stacked layers so that the inner electrode patterns of the ferrite green sheet are connected by at least one straight side electrode. It is made by printing after sintering and connecting side by side, and by printing side electrode and external terminal electrode.

According to the method of the present invention, the work process of connecting the electrodes between the layers is simple, the insulating plate for removing the electrode to the outside is unnecessary, the product defect is reduced and the productivity is improved.

Description

Manufacturing method of chip transformer

1 is an exploded perspective view of a green sheet printed with an internal electrode in a chipped transformer manufactured by the present invention.

FIG. 2 is a perspective view of a chipped transformer in which external electrodes are printed after stacking the green sheets printed by the method of FIG. 1.

FIG. 3 is a conceptual diagram illustrating a coil state inside the chip of FIG. 2.

4 is an exploded perspective view of a green sheet printed with internal electrodes in a chipped transformer manufactured by a conventional method.

5 is an exploded perspective view of a chip-shaped transformer showing a method of connecting internal electrodes to each other by a conventional method.

Explanation of symbols on the main parts of the drawings

111,41: Magnetic Green Sheet

1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,42 Internal electrode pattern or internal printed electrode

25,26,27,28,29,30,51,52: electrode or side electrode for external printed connection

21, 22, 23, 24, 55: External terminal electrode 53: Insulation plate

54: hole

The present invention relates to a method of manufacturing a chip-shaped transformer used in various electronic circuits. More specifically, the present invention relates to a method of manufacturing a transformer consisting of two coils in the form of a chip capable of surface mounting.

In recent years, electronic components have been converted into chip types that can be surface-mounted on substrates due to the miniaturization and digitalization of electronic devices. Accordingly, LC composite filters and transformers are being chipped as well as basic elements such as resistors, capacitors, and inductors. to be.

Conventionally, as a method of manufacturing a transformer, a bulk type wound with coils on both sides of a magnetic core is used, and as a miniaturization proceeds, a method of manufacturing a transformer in a chip form has been developed.

Conventionally, a method of manufacturing a transformer in the form of a chip is according to Japanese Patent Laid-Open No. 2-185005, and is shown in FIGS. 4 and 5.

As shown in FIG. 4, the U-shaped internal electrode patterns 42 are reversed on each of the magnetic green sheets 41 (only three are shown in the drawing) to be printed and connected in a coil form. As shown in Fig. 5, the electrodes exposed at both ends are connected by diagonal external printed connection electrodes 51 and 52, and then the insulating plate 53 is placed thereon, and the holes of the insulating plate 53 By making two terminals withdrawn through 54), a chip-shaped transformer having a total of four terminals is manufactured.

When the chip-shaped transformer is manufactured by the above method, there are the following problems.

First, since the withdrawal positions of the internal electrode patterns 42 printed on the magnetic green sheet 41 are the same in each layer, the connecting electrodes for connecting the interlayer electrodes will be described later, but reference numerals 25, 26, and 27 of FIG. Similarly, it cannot be formed vertically, and should be printed in diagonal lines as in the connecting electrode 52 of FIG. The method of vertically forming the connecting electrode can be easily formed by spraying the electrode paste on the upper end of the connecting electrode forming position. However, when the connecting electrode needs to be printed diagonally, the connecting electrode is printed using a mask having a diagonal pattern. It is difficult to align with the mask because it must.

Second, since the withdrawal direction of the internal electrode pattern 42 is the same as the terminal electrode formation direction (as described later, in the present invention, the withdrawal direction of the internal electrode is withdrawn to the left and right sides of the chip). After that, the insulating plate 53 must be separately installed to draw out only two electrode portions. Therefore, there is a disadvantage in that the number of processes increases, which causes a cost increase.

Accordingly, the present invention is to solve the difficulty of the production of the side connection electrode as described above and the lack of productivity due to the excessive number of processes, it is possible to easily form the side connection electrode for connecting the electrodes between the layers, The purpose of the present invention is to provide a method of manufacturing a chip-type transformer that can prevent an increase in the number of processes and difficulties in manufacturing process by not using the same insulating plate separately.

Hereinafter, the present invention will be described in detail.

The method of manufacturing a chipped transformer according to the present invention consists of the following steps.

Printing the internal electrode patterns in an arbitrary shape on the ferrite green sheets, and printing the alternating forms such that at least one leading end of the internal electrode patterns is led out to the left and right ends of the laminated surface; Stacking a plurality of ferrite green sheets printed with the internal electrode patterns; Simultaneously sintering the laminated ferrite green sheet; Connecting the leading ends of the inner electrode patterns drawn out to the left and right ends of the sintered body with at least one straight external printed connection electrode; And printing an external terminal electrode on the edge of the sintered body in a conventional manner.

According to the method of the present invention, the left and right front end portions of the inner electrode pattern in the ferrite green sheet laminate can be printed to be pulled into different positions for each layer, and in particular, connected to each other by a straight external printed connection electrode while crossing one by one. It is preferable to print as possible.

When described in more detail based on the accompanying drawings of the present invention as follows.

In FIG. 1, reference numeral 111 denotes a ferrite green sheet manufactured by a tape casting method, and reference numerals 1 to 16 denote internal electrode patterns printed in arbitrary shapes on the ferrite green sheet.

As shown in FIG. 1, among the internal electrode patterns 1 to 16 printed in an arbitrary shape on the ferrite green sheet 111, A, C, E, and G layers are connected to each other to form a coil. Internal electrode patterns (1,3,5,7,9,11) printed on layers A, C, E, and g so that layers B, D, F, and H are connected to each other to form another coil. At least one tip of 13, 15 is drawn out to the right end, and at least one of the internal electrode patterns 2, 4, 6, 8, 10, 12, 14, 16 printed on the B, D, F and H layers. One end portion is printed to be drawn out to the left end, but when stacked, they are printed in alternating form so that they are drawn out to different positions for each layer.

After stacking the ferrite green sheets 111 on which the internal electrode patterns 1 to 16 are printed, the ferrite green sheets 111 are sintered at the same time, and as shown in FIG. When the external left-chain connecting electrodes 25, 26, 27, 28, 29, and 30, which are side electrodes for connecting the patterns, are printed, the symbols 1, 3, 5, 7, 9, The internal electrode patterns 11, 13 and 15 are connected in order, and the internal electrode patterns 2, 4, 6, 8, 10, 12, 14 and 16 are connected in this order.

As described above, when the left and right connecting electrodes 25, 26, 27, 28, 29, and 30 are printed and the linear external terminal electrodes 21, 22, 23, 24, and 25 are printed, FIG. A chip-shaped transformer according to the present invention as shown in is to be produced.

3 is a diagram illustrating a coil shape inside a chip-shaped transformer manufactured by the above-described method, wherein the external terminal electrode 21 and the external terminal electrode 22 of FIG. 2 correspond to reference numerals 31 and 32 of FIG. In addition, the external terminal electrode 23 and the external terminal electrode 24 of FIG. 2 correspond to the reference numeral 33 and 34 of FIG. Therefore, a chip-shaped transformer having four terminals in two coils can be manufactured.

In the case of manufacturing the chip transformer according to the method of the present invention, since the connection electrodes 25 to 30 connecting the interlayer internal electrodes are linear, it is possible to form the same as the method for forming the terminal electrodes 21 to 24. Therefore, a separate process is not required to connect the interlayer internal electrodes, and thus, the process is simple, an insulation plate for removing the electrode to the outside is not necessary, and defects in the product are reduced, thereby greatly improving productivity.

In addition, in the case of the transformer, it should be easy to change the number of turns of the two coils, in the case of the present invention, since each coil is connected separately on the right side and the left side, only the number of straight connection electrodes on the left and right sides when the number of turns changes Just change it.

Claims (3)

In the method of manufacturing a chip-shaped transformer, an internal electrode pattern is printed on a plurality of conventional ferrite green sheets in an arbitrary shape, and alternately so that at least one tip of the internal electrode pattern is drawn out to the left and right ends of the laminated surface. Printing in a form; Stacking a plurality of ferrite green sheets printed with the internal electrode patterns; Simultaneously sintering the laminated ferrite green sheet; Connecting the front ends of the internal electrode patterns drawn out to the left and right ends of the sintered sintered body with straight linear external printing connection electrodes; And printing an external terminal electrode on the edge of the sintered body in a conventional manner. The method of claim 1, wherein the left and right front end portions of the internal electrode patterns of the ferrite green sheet laminate are printed so as to be drawn out at different positions for each layer. The chip-shaped transformer of claim 1 or 2, wherein the inner electrode patterns drawn from the ferrite green sheet stack to the left and right front ends are printed so as to be connected to each other by a straight external printed connection electrode while crossing each other. Manufacturing method.