JP2006294724A - Composite electronic component and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite electronic component which can be improved in productivity, and also to provide its manufacturing method. <P>SOLUTION: The composite electronic component comprises a plurality of insulation layers 11, 12, and 13 which are stacked vertically; internal conductors 14 formed in the insulation layers 11, 12, and 13, respectively; a first conductor 15 and a second conductor 16; inductors 17 consisting of the internal conductors 14 and have a part connected to the first conductor 15; and external electrodes 18 connected at least to one end of each of the internal conductors 14, the first conductor 15, and the second conductor 16. In the insulation layer 12 arranged between the first conductor 15 and the second conductor 16, a countermeasure 19 is installed against static electricity. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a composite electronic component used for various electronic devices such as a digital device, an AV device, and an information communication terminal as a noise filter or a countermeasure against static electricity, and a manufacturing method thereof.

  This type of conventional composite electronic component has a configuration as shown in FIG.

  FIG. 10 is an exploded perspective view showing a conventional composite electronic component. As shown in FIG. 10, the conventional composite electronic component is formed by laminating a plurality of magnetic layers 1 made of a magnetic material and a plurality of varistor layers 2 made of a varistor material. A varistor portion 6 comprising an inductor portion 4 comprising a body layer 1 and a conductor 3 formed inside the magnetic layer 1, and a varistor layer 2 and a plurality of internal conductors 5 formed inside the varistor layer 2. And had. The inductor section 4 has a function as a noise filter, and the varistor section 6 has a function as a static electricity countermeasure (surge absorber) that discharges the electrostatic pulse when an electrostatic voltage is applied. . The varistor section 6 is provided by alternately forming a plurality of varistor layers 2 and a plurality of internal conductors 5.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP-A-8-250309

  In the above-described conventional composite electronic component, since different materials of magnetic material and varistor material are used, each material must be formed separately, and these different materials are integrated with each other. Since it is not easy, it is necessary to use an adhesive at the time of lamination, and from these, there is a problem that productivity is poor.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a composite electronic component that can improve productivity and a manufacturing method thereof.

  To achieve the above object, the present invention is formed by a plurality of insulating layers stacked in the vertical direction, an inner conductor, a first conductor and a second conductor provided in the insulating layer, and the inner conductor. A part of the inductor connected to the first conductor, and an external electrode connected to at least one end of each of the inner conductor, the first conductor, and the second conductor, The antistatic part is provided in the insulating layer located between the first conductor and the second conductor.

  As described above, the composite electronic component of the present invention is formed by a plurality of insulating layers stacked in the vertical direction, the inner conductor, the first conductor and the second conductor provided in the insulating layer, and the inner conductor. And an inductor part of which is connected to the first conductor, and an external electrode connected to at least one end of each of the inner conductor, the first conductor, and the second conductor, Since the static electricity countermeasure portion is provided in the insulating layer located between the first conductor and the second conductor, the inductor portion and the static electricity countermeasure portion can be formed in the same type of insulating layer. There is no need to separately form the material of the layer where the antistatic part is provided, and furthermore, since it is easy to integrate the same kind of materials together, there is an excellent effect that productivity can be improved. Is.

(Embodiment 1)
Hereinafter, with reference to the first embodiment, the inventions according to claims 1 to 10, 14 and 15 of the present invention will be described.

  FIG. 1 is an exploded perspective view of a composite electronic component according to Embodiment 1 of the present invention, and FIG. 2 is a perspective view of the composite electronic component.

  As shown in FIGS. 1 and 2, the composite electronic component according to Embodiment 1 of the present invention includes first, second, and third insulating layers 11, 12, and 13 stacked in the vertical direction, and the third An inner conductor 14 provided on the insulating layer 13, a first conductor 15 provided on the second insulating layer 12, a second conductor 16 provided on the first insulating layer 11, and the inner conductor. 14 and a part of the inductor portion 17 connected to the first conductor 15 and at least one end of each of the inner conductor 14, the first conductor 15, and the second conductor 16 are provided. The external electrode 18 is provided, and an electrostatic countermeasure 19 is provided in the second insulating layer 12 located between the first conductor 15 and the second conductor 16.

  The static electricity countermeasure unit 19 includes a hollow portion 20 formed in the second insulating layer 12. The first conductor 15 and the second conductor 16 are formed in different insulating layers.

  The said 1st, 2nd, 3rd insulating layers 11, 12, and 13 in the said structure are comprised in the sheet form with the same kind materials, such as Cu-Zn ferrite and glass ceramic, and have insulation. Further, the first insulating layer 11, the second insulating layer 12, and the third insulating layer 13 are laminated in this order from the bottom. Furthermore, a hollow portion 20 that penetrates the second insulating layer 12 is formed as a static electricity countermeasure portion 19 at a predetermined position of the second insulating layer 12. If a magnetic material is used for the first, second, and third insulating layers 11, 12, and 13, the inductance of the inductor portion 17 can be increased.

  The inner conductor 14 is formed by plating a conductive material such as silver in a spiral shape, and is provided on the upper surface of the third insulating layer 13. In addition, an inductor portion 17 is formed by the inner conductor 14. In this case, as shown in FIG. 1, the inner conductors 14 are formed on the upper surfaces of the two third insulating layers 13, and the inner conductors 14 are connected to each other via the via electrode 21. The inductor portion 17 may be formed.

  The first conductor 15 is formed by linearly plating a conductive material such as silver and is provided on the upper surface of the second insulating layer 12. One end thereof is in contact with the hollow portion 20, and the other end is connected to the inductor portion 17.

  Here, the connection between the first conductor 15 and the inductor portion 17 may be performed by providing a through hole in the third insulating layer 13 between the first conductor 15 and the inner conductor 14, It is easier to connect one end of the first conductor 15 and one end 14 a of the internal conductor 14 via the external electrode 18.

  The second conductor 16 is formed by plating a conductive material such as silver in a layer shape, and is provided on the upper surface of the first insulating layer 11. A part thereof is in contact with the hollow portion 20, and the protruding portion 16 a is connected to the external electrode 18.

  The first conductor 15 and the second conductor 16 are positioned vertically with respect to each other via the hollow portion 20. That is, the first conductor 15 and the second conductor 16 are formed in different insulating layers.

  Here, the distance between the first conductor 15 and the second conductor 16 is a distance that discharges when an electrostatic voltage is applied, and since this distance is equal to the thickness of the hollow portion 20, By simply defining the thickness of the second insulating layer 12 in which the hollow portion 20 is formed, an electrostatic voltage that can be discharged can be easily defined, and between the first conductor 15 and the second conductor 16. Can be suppressed.

  The first conductor 15 and the second conductor 16 may be formed in the same insulating layer. However, the first conductor 15 and the second conductor 16 are formed in different insulating layers, and these are formed on the upper and lower sides. If arranged in the direction, the above-described effects can be obtained.

  Further, the shapes of the inner conductor 14, the first conductor 15, and the second conductor 16 are not limited to the shapes described above, and may be other shapes. Moreover, these may not be formed by plating, but may be formed by other methods such as printing and vapor deposition.

  The hollow portion 20 is a through hole formed in the second insulating layer 12 in order to constitute the static electricity countermeasure portion 19. In addition, a part of the first and second conductors 15 and 16 is exposed in the hollow portion 20, and when the electrostatic voltage is applied from the one end portion 14 a of the inner conductor 14, It has a function of discharging the electrostatic pulse between the two conductors 16.

  Further, the hollow portion 20 is formed by filling a through-hole with a fired extinguisher material, for example, a resin paste containing acrylic bead particles and burning it off during firing. In this way, since the hollow part 20 can be formed at the same time when the composite electronic component is baked and formed, productivity can be further improved.

  Further, dummy insulating layers 22 are provided on the lower surface of the first insulating layer 11 and the upper surface of the uppermost internal conductor 14, and these dummy insulating layers 22 are formed in a sheet shape and are insulated. It has sex. The material is preferably composed of a magnetic material.

  Note that the number of the first to third insulating layers 11 to 13 and the dummy insulating layer 22 is not limited to the number shown in FIG.

  Then, by integrating the above-described components, a main body 23 as shown in FIG. 2 is formed, and external electrodes 18 are provided on the side and end portions of the main body 23. The external electrode 18 is formed by printing silver so as to be connected to both end portions 14 a and 14 b of the internal conductor 14 and the protruding portion 16 a of the second conductor 16. The first conductor 15 and the external electrode 18 are connected via the one end portion 14 a of the internal conductor 14. The surface of the external electrode 18 is provided with a nickel plating layer and a tin plating layer.

  FIG. 3 shows an equivalent circuit diagram of the composite electronic component according to the first embodiment of the present invention. In FIG. 3, normally, a differential current flows through the inductor section 17, and static electricity exceeding a certain voltage is shown. When a voltage is applied, the static electricity countermeasure unit 19 discharges the static electricity pulse to protect elements and the like downstream of the inductor unit 17.

  Next, a method for manufacturing the composite electronic component common mode noise filter according to Embodiment 1 of the present invention will be described.

  1 and 2, first, a predetermined number of rectangular first to third insulating layers 11 to 13 and dummy insulating layers 22 are respectively made of a mixture of insulating material powder and resin as raw materials. . At this time, a through hole is formed in a predetermined portion of the second insulating layer 12 by drilling with a laser, punching, or the like.

  Next, the first insulating layer 11 is disposed on the upper surface of the predetermined number of dummy insulating layers 22.

  Next, the second conductor 16 is formed on the upper surface of the first insulating layer 11 by plating.

  Next, the second insulating layer 12 in which a through hole is formed is disposed on the upper surface of the second conductor 16. At this time, a part of the second conductor 16 is exposed to the through hole.

  Next, the through hole of the second insulating layer 12 is filled with a resin paste containing carbon particles or acrylic beads as a burnt-off material. Thereby, the hollow part 20 can be formed easily. In addition, as the fired extinguishing material, for example, an acrylic resin, an epoxy resin, a butyral resin, a phenol resin, ethyl cellulose or the like other than the above may be used.

  Next, the first conductor 15 is formed on the upper surface of the second insulating layer 12 by plating. At this time, the first conductor 15 is exposed in the through hole of the second insulating layer 12.

  Next, the third insulating layer 13 is disposed on the upper surface of the first conductor 15.

  Next, the inner conductor 14 is formed on the upper surface of the third insulating layer 13 by plating. Thereafter, the third insulating layer 13 and the inner conductor 14 may be formed in the same manner, and the third insulating layers 13 may be connected to each other via the via electrode 21.

  In addition, the formation method of the internal conductor 14, the 1st conductor 15, and the 2nd conductor 16 forms the conductor of a predetermined pattern shape by plating on the base plate (not shown) prepared separately, Then, this conductor is made into each It is formed by transferring to an insulator layer.

  Next, a predetermined number of dummy insulating layers 22 are sequentially arranged on the upper surface of the uppermost internal conductor 14 to form the main body 23.

  Next, the main body 23 is fired at a predetermined temperature and time. At this time, since the burnt-out particles filled in the through holes of the second insulating layer 12 disappear, the hollow portion 20 can be easily formed in the second insulating layer 12.

  Next, silver is printed on both side surfaces and both end surfaces of the main body portion 23 so as to be connected to both end portions 14a and 14b of the internal conductor 14 and the protruding portion 16a of the second conductor 16, thereby forming the external electrodes 18. To do.

  Finally, a nickel plating layer and a tin plating layer are formed on the surface of the external electrode 18 by plating.

  In the first embodiment of the present invention described above, since the static electricity countermeasure portion 19 is provided in the second insulating layer 12 between the first conductor 15 and the second conductor 16, the inductor portion 17 and the static electricity countermeasure The part 19 can be formed in the same type of insulating layer, so that it is not necessary to separately form the material of the layer in which the inductor part 17 and the static electricity countermeasure part 19 are provided, and the same kind of materials are integrated with each other. Since it is easy to do, the effect that productivity can be improved is acquired.

  Further, by using the hollow portion 20 as the static electricity countermeasure portion 19, it is possible to reduce the thickness of the product as compared with the case where a plurality of varistor layers and a plurality of internal conductors are alternately laminated.

  As shown in FIG. 4A, the shape of the first conductor 15 may be such that the tip portion 15a is narrower than the other portion 15b of the first conductor 15. In this configuration, When a voltage is applied, the current density at the tip 15a of the first conductor 15 can be increased, so that an electrostatic voltage is discharged between the tip 15a of the first conductor 15 and the second conductor 16. It becomes easy to be done.

  Further, as shown in FIG. 4B, the tip 15c of the first conductor 15 may be shaped so as to cover the entire surface of the hollow portion 20. In this configuration, the first conductor 15 and the second conductor 15 Since the distance between the conductors 16 can be minimized, it is possible to discharge more reliably between the first conductor 15 and the second conductor 16. Here, FIGS. 4A and 4B show only the second insulating layer 12, the first conductor 15, and the hollow portion 20 in order to simplify the description.

  Furthermore, the first conductor 15 and the second conductor 16 may not overlap each other when viewed from above, and in this configuration, the interval between the first conductor 15 and the second conductor 16 is increased. Therefore, it is possible to suppress a short circuit between the first conductor 15 and the second conductor 16 when an electrostatic voltage equal to or lower than a predetermined voltage is applied.

  In the composite electronic component according to the first embodiment of the present invention, the case where the hollow portion 20 is used as the static electricity countermeasure portion 19 has been described, but the hollow portion 20 filled with a voltage-dependent material may be used. Good. In this case, since the voltage-dependent material is filled in the hollow portion 20, the static electricity countermeasure portion 19 can more efficiently discharge an electrostatic voltage higher than a certain voltage. Furthermore, as the voltage-dependent material, a varistor material such as a ceramic material mainly composed of zinc oxide may be filled. In this case, when the electrostatic voltage is equal to or lower than a certain voltage, the first conductor 15 and The insulation between the second conductor 16 can be maintained.

(Embodiment 2)
Hereinafter, the invention according to the 11th to 13th aspects of the present invention will be described using the second embodiment.

  FIG. 5 is an exploded perspective view of the composite electronic component according to Embodiment 2 of the present invention, and FIG. 6 is a perspective view of the composite electronic component. In addition, about what has the structure similar to the structure of Embodiment 1 of this invention mentioned above, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  5 and 6, the second embodiment of the present invention is different from the first embodiment in that two inductor portions 17 each including an internal conductor 14 are provided, and the plurality of inductor portions 17 are magnetically coupled to each other. The point is that there are two first conductors 15 connected to one inductor portion 17.

  At this time, the two inductor portions 17 are stacked in the vertical direction. In order to magnetically couple the two inductor portions 17 to each other, at least the third insulating layer 13 may be made of a magnetic material.

  Thus, by providing two inductor portions 17 and magnetically coupling the two inductor portions 17 to each other, the inductance of the inductor portion 17 can be increased.

  As a result, the two inductor portions 17 can be a common mode noise filter or a two-mode noise filter that removes noise in two modes of a common mode and a normal mode (differential mode). A composite electronic component combining the mode noise filter and the static electricity countermeasure part 19 (hollow part 20) is obtained.

  FIG. 7A shows an equivalent circuit diagram of the composite electronic component having the above-described configuration. In this case, the positional relationship is such that one inductor portion 17 and two static electricity countermeasure portions 19 are π-type. ing.

  In the second embodiment of the present invention, two first conductors 15 connected to one inductor portion 17 are provided, but one may be provided, and an equivalent circuit in this case is shown in FIG. As shown in (b), the positional relationship is such that one inductor section 17 and one static electricity countermeasure section 19 are T-shaped.

  Further, the first and second conductors 15 and 16 are provided only below the inductor portion 17, but as shown in FIG. 8, the first conductor 15 is provided above and below the inductor portion 17, respectively. And the second conductor 16 may be provided. In this case, since the two first and second conductors 15 and 16 respectively corresponding to the two inductor portions 17 can be arranged in a balanced manner, stable characteristics can be obtained. It is done.

  At this time, the first conductor 15 connected to the lower inductor portion 17 and the second conductor 16 forming the static electricity countermeasure portion 19 between the first conductor 15 and the upper inductor portion are provided below. Similarly, the corresponding first and second conductors 15 and 16 are provided on the upper side.

  The two inductor portions 17 are stacked in the vertical direction. However, as shown in FIG. 9, two internal conductors 14 constituting the two inductor portions 17 are provided on the same third insulating layer 13. Two inductor portions 17 may be arranged in the lateral direction.

  Furthermore, although the number of inductors 17 is two, it may be three or more.

  The composite electronic component and the manufacturing method thereof according to the present invention can improve productivity, and are useful as noise filters or static electricity countermeasures for various electronic devices such as digital devices, AV devices, and information communication terminals.

1 is an exploded perspective view of a composite electronic component according to Embodiment 1 of the present invention. Perspective view of the composite electronic component Equivalent circuit diagram of the composite electronic component (A) (b) The top view which shows the principal part of the other example of the composite electronic component The disassembled perspective view of the composite electronic component in Embodiment 2 of this invention Perspective view of the composite electronic component (A) Equivalent circuit diagram of the composite electronic component, (b) Equivalent circuit diagram of another example of the composite electronic component An exploded perspective view of another example of the composite electronic component An exploded perspective view of another example of the composite electronic component An exploded perspective view of a conventional composite electronic component

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 1st insulating layer 12 2nd insulating layer 13 3rd insulating layer 14 Inner conductor 15 1st conductor 16 2nd conductor 17 Inductor part 18 External electrode 19 Static electricity countermeasure part 20 Hollow part

Claims (15)

A plurality of insulating layers stacked in the vertical direction, an inner conductor provided in the insulating layer, a first conductor and a second conductor, and the inner conductor, and a part thereof is the first conductor. And an external electrode connected to at least one end of each of the internal conductor, the first conductor, and the second conductor, and between the first conductor and the second conductor A composite electronic component with an anti-static part on the insulating layer located in the center. The composite electronic component according to claim 1, wherein the static electricity countermeasure portion is constituted by a hollow portion formed in an insulating layer. The composite electronic component according to claim 2, wherein the hollow portion is formed by filling a through-hole of the insulating layer with a fired-off material that disappears when fired. The composite electronic component according to claim 2, wherein the hollow portion is filled with a voltage-dependent material. The composite electronic component according to claim 4, wherein a varistor material is used as the voltage-dependent material. The composite electronic component according to claim 1, wherein the first conductor is connected to the inductor portion via an external electrode. The composite electronic component according to claim 2, wherein the first conductor and the second conductor are arranged so as to be positioned in the vertical direction through the hollow portion. The composite electronic component according to claim 7, wherein the first conductor and the second conductor are configured not to overlap each other when viewed from above. The composite electronic component according to claim 7, wherein at least one of the first conductor and the second conductor covers the entire area of the hollow portion. The composite electronic component according to claim 7, wherein at least one of the first conductor and the second conductor has a tip end thinner than the other part. The composite electronic component according to claim 1, wherein a plurality of inductor portions are provided, and the plurality of inductor portions are magnetically coupled to each other. The composite electronic component according to claim 11, wherein the inductor portion is a common mode noise filter or a two-mode noise filter. The composite electronic component according to claim 11, wherein a first conductor and a second conductor are respectively provided above and below the plurality of inductor portions. A step of forming a second conductor on the upper surface of the first insulating layer; and a second insulating layer having a through hole on the upper surface of the second conductor, the through hole being in contact with the tip of the second conductor The first conductor is formed on the upper surface of the second insulating layer so that the tip thereof is in contact with the through hole. A step of forming a third insulating layer on a top surface of the first conductor so that a part of the inductor portion is in contact with the first conductor, and firing the first to third insulating layers. And the manufacturing method of the composite electronic component provided with the process of making the said baking loss | disappearance material lose | disappear. The method for producing a composite electronic component according to claim 14, wherein a material that contains carbon particles or acrylic beads in a resin paste is used as the fired material.

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