JPH04111709U - Stacked inductor device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a multilayer inductor device that can be manufactured at low cost and has improved reliability. [Structure] Magnetic layers and conductors are alternately laminated between magnetic plates, and a starting end portion of the first laminated layer and a terminal portion of the final laminated layer of the conductors are exposed on the edge side of the magnetic plate. In the multilayer inductor device, the magnetic layer 5
has cutout windows 6 for connecting conductors 4 superimposed on both sides. At least one of the conductors 4 is
External electrodes 7 are formed on the exposed portions 2', 3' of the conductor on the edge side of the magnetic plate, which have Π-shaped shapes 2'', 3''.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention is an integrated circuit that laminates a magnetic layer and a coil conductor and is mounted on a printed wiring board. The present invention relates to a multilayer inductor device used as an inductor element or an impedance element.

0002

[Conventional technology]

Multilayer inductor devices mounted on printed wiring boards are made of strong materials such as ferrite. Multiple magnetic plates made by processing magnetic raw sheets into desired dimensions. and multiple conductors inserted alternately between them. Ru. Conventionally, an example of the assembly of this type of multilayer inductor device is shown in Figs. 7(a) and 7(b). show. In the figure, as shown in (a), a raw magnetic sheet was processed into the desired shape. As shown in (b), the first starting end portion 52' is placed on the magnetic plate 51'. A fishing conductor 54a is made to protrude from the edge and corresponds to about 1/2 of the winding length per layer. print. Then, the terminal portion 53a of the conductor 54a in (b) is exposed. As shown in (c), a thin magnetic plate 55 is superimposed on the left side part in the figure, and on top of this, as shown in (d). Connect the end portion 53a and the second end portion 52a as shown in FIG. A U-shaped second conductor 54 of the same length is superimposed. Also, as in (e), the second The terminal portion 53 of the conductor 54 is exposed, and the third magnetic layer 55 is superimposed on the third magnetic layer 55. Then, as shown in (f), connect the terminal end part 53 and the next starting end part 2 to make a phase of about 1/2 winding length. A U-shaped third conductor 54b of the same length is superimposed. These means are sequentially (g ) (h), and in the same manner as above, alternately overlap the magnetic layer 55 and the conductor 54 several times, and then In this case, the terminal part 53' as shown in (j) is connected to the terminal part 53 as shown in (i). It corresponds to 1/2 winding length and the terminal end portion is opposite to the starting end portion 52 of the first conductor 54. The final conductive material 54 is superimposed on the edge of the final magnetic material plate 5 as shown in (k). An inductor element is formed overlapping the entire surface with 1'. This inductor element The starting end 52' of the first conductor 54 and the terminal end of the last conductor 54e 53', and an external electrode (not shown) is connected to the protruding surface using a conductive material. A multilayer inductor is formed.

0003

[Problem that the idea aims to solve]

However, in conventional multilayer inductor devices, the coil capacity per layer is 1/2 the number of turns. If the desired number of turns is N, then the number of conductors 54a, 54b, etc. required for the process is The number of layers is 2N, and the number of layers of the magnetic layer 55 is 2N-1. The process is 4N-1, and the pattern of the conductors 54a, 54b... is replaced each time. The disadvantage is that it increases the manufacturing price. In addition, the length of the conductor is equivalent to 1/2 turn length per layer. In a commonly used coil in which an electric body 54 and a magnetic plate 51 are laminated, The end of the conductor 54 becomes the corner of the coil, and the width of the conductor 54a, 54b... It forms an overlapping part of squares, especially when the value of the multilayer inductor is small. The area is also small, making it difficult to make sufficient contact at each connection point, and furthermore, the contact between both ends of the inductor element The ends 52' and 53' of the conductor 54 protruding from the surface can also be connected to external electrodes (not shown). It has the disadvantage of being inadequate.

0004 Therefore, the technical challenge of this invention is to create a multilayer type that can be manufactured at low cost and has increased reliability. An object of the present invention is to provide an inductor device.

[0005]

[Means to solve the problem]

According to the present invention, the magnetic layers and the conductor are alternately laminated between the magnetic plates, and The starting end portion of the first laminated layer and the ending portion of the final laminated layer of the conductor are connected to the magnetic layer. In a multilayer inductor device exposed on the edge side of the body plate, the magnetic layer is on both sides. A laminated layer characterized by having a cutout window for connecting a conductor superimposed on the A type inductor device is obtained. According to the present invention, at least one of the conductors has a Π shape. A multilayer inductor device with the following characteristics can be obtained. According to the present invention, an external electrode is formed on the exposed portion of the conductor on the edge side of the magnetic plate. A multilayer inductor device characterized by the following is obtained.

[0006]

[Effect]

In the multilayer inductor device of the present invention, a cutout window is provided in the magnetic layer. , the connection strength between conductors can be increased, and in addition, conventionally wound coils can be , for each layer of conductor for every 1/2 turn length in the transformer. A conductor corresponding to at least 1/2 turn length (preferably 3/4 turn length) An electric body can be provided, and the size of the multilayer inductor itself can be reduced. Ru. In addition, in this invention, the conductor of the extraction electrode part has a Π shape. , it can improve the connection strength between the conductor and the external electrode and improve reliability. . A coil with this conductor as a winding and a magnetic plate and a magnetic layer as a magnetic core may also be used. transformers can be constructed.

[0007]

【Example】

Embodiments of the multilayer inductor device of the present invention will be described below with reference to the drawings. FIG. 1 is an assembled and disassembled perspective view showing a multilayer inductor element according to a first embodiment of the present invention. It is a diagram. As shown in Figure 1, in one chip that was generated in succession, A first starting end portion 2' is made to protrude from the edge of a raw magnetic material plate 1 made of a magnetic material. Vortex band made of silver or silver palladium with a length corresponding to 3/4 turns of the winding per layer A first conductor 4 having a shape is printed. The terminal portion 3 is exposed on this first conductor 4. Ferrite powder and methyl cell nose with cutout windows 6 carved in positions such that It consists of a magnetic paste mixed with a binding resin such as. This first magnetic layer 5 is A thin first magnetic layer 5 is superimposed. Furthermore, on the first magnetic layer 5, the notch The terminal end portion 3 and the starting end portion 2 of the first conductor 4 exposed through the opening window 6 are in contact with each other in the longitudinal direction. A second conductor 4 having a length corresponding to approximately 3/4 turn length is printed so as to be continuous. Below In the same manner as below, the magnetic layer 5 provided with the cutout window 6 is inserted through the cutout window 6 into the terminal portion. 2 and the starting end part 3, the conductor 4 is sequentially overlapped, and the terminal end part 3' becomes a magnetic material layer. The protruding conductor 4 is superimposed on the edge of the conductor 5. At the end, place a slightly thin magnetic plate 1' on top. When pressurized, the inductor has its terminal end portion 3' exposed on the opposing end face as shown in Figure 2. Element 8 is formed. This is sintered as a single piece, and the starting points are exposed protruding from both opposing end faces. The end portion 2' and the end portion 3 are connected and removed by applying silver paste or baking. By providing the partial electrode 7, a laminated inductor device as shown in FIG. 3 is formed.

[0008] Therefore, in the multilayer inductor device according to the first embodiment of the present invention, one layer The length of each conductor 4 corresponds to 3/4 winding length, so the same number of turns can be made compared to the conventional method. In order to achieve this, there are five layers of the conductor 4 and four layers of the magnetic layer, as in the example of FIG. Sunawa The number of layers of the conductor 4 for the desired number of turns N is 5N/3, and the number of layers of the magnetic layer 5 is 5N. /3-1, and both the number of conductive layers 4 and the number of magnetic layers 5 are significantly reduced. or Between the starting end portion 3 and the ending end portion 3 connected at the notch window 6 of the magnetic layer 5 Since all superpositions are performed in the longitudinal direction and in a constant direction, the length of the superposition can be calculated at least In addition to being able to print larger than the body width, it is possible to print clear conductive materials, improving reliability. .

[0009] FIG. 4 is an exploded perspective view of a multilayer inductor element according to a second embodiment of the present invention. Ru. As shown in FIG. Conductors 4 having a length corresponding to 3/4 winding length of the wire are alternately stacked. but, The conductor 4 in contact with the first magnetic plate 1' has its starting end 2' connected to the magnetic plate 1'. It is printed integrated with the type II conductor 2″ exposed to the edge. Similarly, the last Also in the conductor 4 in contact with the magnetic plate 1, there is a Π-shaped portion exposed at the edge of the magnetic plate 1'. The inductor element 18 molded here is integrated with the conductor 3'' and printed. , as shown in FIG. 5, a length corresponding to the chip length is provided on the end face of the inductor element 18. Connect to the conductor 3" exposed from both end faces, and use conductive material such as silver paste to connect both end faces. A laminated inductor having an external electrode 7 as shown in FIG. 6 is formed covering it. Therefore, the connection area between the conductors 2'' and 3'' and the external electrode 7 becomes large, increasing the connection strength. I can listen. Furthermore, the conductor 4 and the external electrode 7 are conductors 3″, that is, two Reliability is greatly increased by connecting multiple conductors.

0010

[Effect of the idea] As explained above, according to the present invention, the length of the conductor per layer can be reduced from the conventional length. The length is equivalent to 3/4 turns instead of 2 turns, so the number of turns is the same. In this case, the printing process for both magnetic plate 1 and conductor 4 was saved and simplified, and the price was reduced. A stacked inductor device can be provided. Furthermore, according to the present invention, the external electrode and the end of the conductor are connected via the Π-shaped conductor. This increases connection strength and provides highly reliable multilayer inductor equipment. location can be provided.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a multilayer inductor element according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the inductor element of FIG. 1;

FIG. 3 is a perspective view of a multilayer inductor device in which external terminals are provided on the end faces of the inductor elements in FIG. 2;

FIG. 4 is an exploded perspective view of a multilayer inductor element according to a second embodiment of the present invention.

FIG. 5 is a perspective view of the inductor element of FIG. 4;

6 is an external perspective view of a multilayer inductor device in which external terminals are provided on the end faces of the inductor elements shown in FIG. 5. FIG.

FIGS. 7A to 7K are plan views showing the assembly of a conventional multilayer inductor device.

[Explanation of symbols] 1 Magnetic plate 2 Starting part 2' Starting end part 2″ Π type conductor 3 Terminal part 3' End part 3″ Π type conductor 4 Electric conductor 5 Magnetic layer 6 Cutout window 7 External electrode 8 Inductor element 18 Inductor element 51' Magnetic plate 52' Starting end part 52a Starting end part 52b Starting end part 52c Starting end part 53a Terminal part 53b Terminal part 53c Terminal part 53d Terminal part 53' End part 54a Electric conductor 54b conductor 54c conductor 54d conductor 54e Conductor

Claims (3)

[Scope of utility model registration request] 1. A magnetic layer and a conductor are alternately laminated between magnetic plates, and a starting end portion of the first laminated layer and a terminal portion of the final laminated layer of the conductive layer are placed on the edge side of the magnetic plate. What is claimed is: 1. A multilayer inductor device in which the magnetic layer has a cutout window for connecting conductors superimposed on both surfaces thereof. 2. The multilayer inductor device according to claim 1, wherein at least one of the conductors has a Π shape. 3. The multilayer inductor device according to claim 1, wherein an external electrode is formed on an exposed portion of the conductor on the edge side of the magnetic plate.