JPH05326269A - Layered chip coil - Google Patents

Abstract

PURPOSE:To obtain a layered chip coil having a structure which can cope with large current applications without causing a reduction in impedance. CONSTITUTION:A plurality of coil conductors 15 to 17 are formed inside a magnetic block 12, and a terminal electrode 13a which is electrically connected to one end 15a of the coil conductor 15 and a terminal electrode 13b which is electrically connected to one end 16 of the coil conductor 16 are formed on the side surfaces 12c, 12d of the magnetic block 12. In this layered chip coil, by a connecting electrode 14a formed with the other end 15b of the coil conductor 15 and one end 17b of the coil conductor 17 on the side surface 12a, the other end 16a of the coil conductor 16 is connected to one end 17a of the coil conductor 17 by a connecting electrode 14b so that they may be electrically connected to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip type laminated coil, and more particularly to a chip type laminated coil having a structure capable of handling a large current of 3 A or more.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view showing an example of a conventional chip type coil. The chip-type coil 1 is configured to be able to handle a current of 3 A or less. In the chip type coil 1, the through hole 3 is formed in the magnetic block 2.
a to 3c are formed so as to extend from the side surface 2a to the side surface 2b. The through holes 3a to 3c have a structure in which a through hole is filled with a conductive material. The connection electrode 4 is provided on the side surface 2a.
a, 4b and connection electrodes 5a, 5b are formed on the side surface 2b. The connection electrodes 4a and 5a are provided so as to electrically connect the through hole 3a and the through hole 3b, and the through hole 3b and the through hole 3c, respectively. The connection electrode 5b is formed so as to electrically connect the through hole 3a and the terminal electrode 6a, and the connection electrode 4b is formed so as to electrically connect the through hole 3c and the terminal electrode 6b.

In the chip type coil 1, the through hole 3a
3c and the connecting electrodes 4a and 5a form a coil portion in the magnetic body block 2. Since the through holes 3a to 3c are formed by linearly penetrating between the side surfaces 2a and 2b, the connection electrodes 4a and 5a are formed.
Not only simply connects the through holes 3a to 3c, but also functions as a part of the winding portion of the coil portion. FIG. 8 is a perspective view showing a conventional chip-type inductor. The chip type inductor 7 has a structure in which a through hole is formed in the magnetic block 8 from one end surface to the other end surface, and an elongated rectangular plate-shaped metal terminal 9 is inserted into the through hole. Both ends of the metal terminal 9 are electrically connected to terminal electrodes 10a and 10b formed so as to cover both end surfaces of the magnetic block 8. The chip inductor can be configured to withstand high currents in excess of 3A.

[0004]

However, as shown in FIG.
The chip-type coil 1 and the inductor 7 shown in FIG. 8 have a problem that it is difficult to handle a larger current without increasing the impedance. That is, in the chip-type inductor 7, in order to improve the impedance, the magnetic block 7 and the metal terminal 9 have to be long when the width and height of the magnetic block 8 are constant. As a result, the overall size must be very large.

Further, in the chip type coil 1, when it is attempted to cope with a current larger than 3 A, for example, a current of 6 A or more, it is impossible to use a thin through hole such as the through holes 3a to 3c, and the width is considerably wide. A wide conductor must be embedded between the side surfaces 2a and 2b. As a result, like the metal terminal 9 in the chip type inductor 7 shown in FIG. 8, one thick metal terminal must be embedded so as to be inserted between the side surfaces 2a and 2b, and eventually the impedance is lowered. I can't get it. In order to increase the impedance in such a structure, the distance between the side surfaces 2a and 2b must be increased in the same manner as in the case of the chip type inductor 7, which also leads to an increase in the size of the magnetic block 2.

Therefore, an object of the present invention is to provide a small chip type coil applicable to a large current application without lowering the impedance.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and is a magnetic body block and is embedded in the magnetic body block, and both ends are on the side surface of the magnetic body block. And a plurality of exposed coil conductors, the end portions of the coil conductors to be connected to each other are exposed at positions separated by a predetermined distance in the thickness direction on the side surface of the magnetic block, and are connected to each other. At least one connection electrode formed on the side surface of the magnetic block so as to electrically connect the ends of the coil conductor to be formed,
A pair of terminal electrodes formed on the side surfaces of the magnetic block so as to be electrically connected to both ends of a coil portion formed by connecting the plurality of coil conductors with the at least one connection electrode. A chip-type laminated coil, comprising:

[0008]

In the chip type laminated coil of the present invention, the coil portion is formed by using a plurality of coil conductors embedded in the magnetic material block, and is connected by the connection electrodes formed on the side surfaces of the magnetic material block. Form a coil part. Therefore, by selecting the width and thickness of the coil conductor, a coil portion that can withstand a large current can be easily configured. Moreover, since the coil portion is formed by the coil conductor and the connection electrode, the coil portion that is much longer than the length of the magnetic body block is formed. It is possible to increase the impedance.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be clarified by describing embodiments of the present invention with reference to the drawings. Figure 1
[FIG. 1] is a perspective view showing a chip type laminated coil according to a first embodiment. The chip type laminated coil 11 is configured by using a rectangular plate-shaped magnetic body block 12. Terminal electrodes 13a and 13b are respectively provided so as to cover the pair of side surfaces facing each other of the magnetic body block 12, and connection electrodes 14a and 14b are respectively provided in the central regions of the other pair of side surfaces 12a and 12b facing each other. Has been formed.

As shown in FIG. 2A, coil conductors 15 to 17 are embedded in the magnetic block 12 at different height positions separated by a magnetic layer. One end 15a of the coil conductor 15 is a side surface 12c of the magnetic block 12.
The other end 15b is exposed on the side surface 12a. Also,
One end 16a of the coil conductor 16 is on the side surface 12b, and the other end 16 is
b is exposed on the side surface 12d. Further, one end 17a of the coil conductor 17 is on the side surface 12b, and the other end 17b is on the side surface 1.
It is exposed to 2a. One end 15 of the coil conductor 15
a is electrically connected to the terminal electrode 13a shown in FIG. 1, and the other end 16b of the coil conductor 16 is electrically connected to the terminal electrode 13b. The other end 15b of the coil conductor 15 and the other end 17b of the coil conductor 17 are connected to the connection electrode 14a, and the one end 16a of the coil conductor 16 is connected.
And one end 17a of the coil conductor 17 are electrically connected to the connection electrode 14b. Therefore, in the chip type laminated coil 11 of the present embodiment, as shown in the schematic perspective view of the conductor line in FIG. It is configured, and its equivalent circuit is as shown in FIG.

The magnetic block 12 is prepared by preparing a plurality of magnetic green sheets, and a conductive paste mainly composed of Cu or the like for forming the coil conductors 15 to 17 on the three green sheets. Is pattern-printed, laminated in the thickness direction, and an appropriate number of magnetic green sheets are laminated on the upper and lower sides, and the obtained laminated body is fired. Further, the side surfaces 12a to 12d of the magnetic body block 12 obtained by firing as described above.
Then, the terminal electrodes 13a, 13b and the connection electrodes 14a, 14b can be formed by printing and baking a conductive paste, or by an appropriate method such as vapor deposition or plating.

However, the method of obtaining the chip type laminated coil 11 of the present embodiment is not limited to the above manufacturing method. For example, the magnetic body block 12 may be formed by adhering a baked magnetic body plate on which the coil conductors 15 to 17 are previously formed by printing or the like. Figure 7
In the conventional chip type coil 1 shown in FIG.
Since a to 3c constituted a part of the coil portion, it was not possible to withstand a large current exceeding 3A. In the chip type laminated coil 11 of the present embodiment, as described above, the coil conductors 15 to
17 does not depend on the through hole, but on the side surface 12a,
A coil portion is formed by being electrically connected by the connection electrodes 14a and 14b formed on 12b. Therefore, by selecting the thickness and width of the coil conductors 15 to 17, it is possible to construct a coil portion that can withstand a large current of 6 A or more.

FIG. 4A is a perspective view for explaining a chip type laminated coil according to the second embodiment, and is a view corresponding to FIG. 2A showing the first embodiment. That is, in the second embodiment, inside the magnetic block 22,
A plurality of coil conductors 25 and 26 are formed at different height positions with the magnetic layer separated. One coil conductor 25
Has one end 25a on the side surface 22c and the other end 25b on the side surface 22.
It is exposed to a and is routed about 3/4 turn in the plane of the magnetic block 22. Similarly, the coil conductor 26 has one end 26 a on the side surface 22 a and the other end 26 a.
b is exposed on the side surface 22d, and the magnetic block 22
It is routed about 3/4 turn in the plane.

In the chip type laminated coil of the second embodiment,
The terminal electrodes 13a and 13b shown in FIG. 1 are formed so as to cover the side surfaces 22c and 22d of the magnetic body block 22, and the coil conductors 25 and 2 are formed in the central region of the side surface 22a.
The connection electrode 14 shown in FIG. 1 so as to electrically connect 6
a is formed. Therefore, in the chip type laminated coil 21 of the second embodiment, as shown in FIG. 4B, a coil portion of 1.5 turns is formed between the terminal electrodes 13a and 13b. Also in the second embodiment, as in the case of the first embodiment, the coil conductors 25 and 26 are connected to the magnetic block 22.
Since the side surface 22a is electrically connected to each other by the connection electrode, the coil portion can be configured to withstand a large current of 6 A or more by selecting the width and thickness of the coil conductors 25 and 26.

In the first embodiment, the coil portion of one turn is
In the second embodiment, the coil portion having 1.5 turns is formed, but the chip type laminated coil of the present invention may be configured to have a coil portion having two or more turns. For example, as shown in a schematic perspective view of the conductor line portion in FIG. 5, coil conductors 35, 36, 37 are formed along the inner three sides of the side surfaces of the magnetic body block, and the connection electrodes 34a, If the portion to be connected by 34b is electrically connected to form the coil portion, the coil portion having 2.25 turns can be formed between the terminal electrodes 33a and 33b. Further, in the above-mentioned embodiments, the chip type laminated coil in which one coil portion is formed between the pair of terminal electrodes has been described, but the chip type laminated coil of the present invention has a plurality of coil portions in one magnetic body block. May be configured.

For example, as shown in the schematic perspective view of the conductor line portion in the magnetic block in FIG. 6, the terminal electrodes 43a,
The plurality of coil conductors 45 and 46 and the connecting electrode 4 are provided between the electrodes 43b.
The coil portion of 1.5 turns constituted by 4 is formed, and the terminal electrodes 53a, 5 are formed at different height positions from the coil portion.
A plurality of coil conductors 55, 56 and a connection electrode 54 are provided between the 3b.
Similarly, a coil portion of 1.5 turns may be configured. In this case, it is preferable that the terminal electrodes 43a and 43b and the terminal electrodes 53a and 53b are not arranged close to each other on the side surface of the magnetic body block. Therefore, preferably, each terminal electrode is formed along the corner portion of the magnetic body block. It In the chip type laminated coil shown in FIG. 6, since a plurality of coil portions are configured in a single magnetic body block as described above, the laminated coil is suitable for a common mode choke coil, a transformer, etc. Can be used.

[0017]

According to the present invention, the coil portion is constituted by the plurality of coil conductors embedded in the magnetic block and the connection electrodes formed on the side surfaces of the magnetic block. Therefore, by selecting the thickness and width of the coil conductor, it is possible to configure a coil portion that can withstand a large current. Moreover, since the coil portion is formed in the magnetic block, the impedance can be increased without increasing the size of the magnetic block. Therefore,
A chip type laminated coil capable of withstanding a rated current larger than 3 A, for example, a large current of about 6 A to 7 A can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing a chip type laminated coil according to a first embodiment.

2A and 2B are respectively a schematic perspective view showing a coil conductor portion and a perspective view schematically showing a conductor line portion of the chip type laminated coil of the first embodiment.

FIG. 3 is a diagram showing an equivalent circuit of the chip type laminated coil of the first embodiment.

4A and 4B are a schematic perspective view for explaining a coil conductor and a schematic perspective view showing a conductor line portion in a chip type laminated coil according to a second embodiment.

FIG. 5 is a perspective view schematically showing a conductor line portion of a chip type laminated coil according to a third embodiment.

FIG. 6 is a schematic perspective view for explaining a conductor line portion in a chip type laminated coil of an embodiment in which a plurality of coil portions are configured.

FIG. 7 is a perspective view showing an example of a conventional chip coil.

FIG. 8 is a perspective view showing an example of a conventional chip-type inductor.

[Explanation of symbols]

 11 ... Chip type laminated coil 12 ... Magnetic material block 12a-12d ... Side surface 13a, 13b ... Terminal electrode 14a, 14b ... Connection electrode 15-17 ... Coil conductor

Claims (1)

[Claims] 1. A coil conductor to be mutually connected, comprising: a magnetic block; and a plurality of coil conductors embedded in the magnetic block, both ends of which are exposed at side surfaces of the magnetic block. End portions of the coil conductors are exposed at positions separated by a predetermined distance in the thickness direction on the side surface of the magnetic body block, and the magnetic conductor blocks are electrically connected to the end portions of the coil conductors to be mutually connected. At least one connection electrode formed on the side surface of the body block, and so as to be electrically connected to both ends of the coil portion configured by connecting the plurality of coil conductors with the at least one connection electrode, respectively. A chip type laminated coil, comprising: a pair of terminal electrodes formed on a side surface of the magnetic block.