JPH02232915A - Chip type lc composite ceramic component - Google Patents

Abstract

PURPOSE:To obtain a composite ceramic component with a laminated ceramic substrate by a method wherein a composite ceramic material is formed with the mixed sintered body having permittivity and permeability and containing the ferrite of specific metal oxide and the dielectric compound of specific metal titanate. CONSTITUTION:When the ferrite of metal oxide MFe3O4, having the metal element M containing one or more element selected from manganese, nickel, magnesium, cobalt, zinc and iron, and a mixed sintered body, having a permittivity of 2.0 or higher and permeability of 1 or higher and containing the dielectric compound consisting of one or more groups of barium titanate, titanate and strontium titanate, are used as a composite ceramic material, a chip type LC composite ceramic component, having both capacitor function and induction function, is formed by a lamination substrate without putting together two kinds of lamination substrates.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a chip-type LC composite ceramic component having both a capacitor function and an inductor function. [Prior Art] In the past, attempts have been made to miniaturize the entire integrated circuit board by incorporating capacitor and inductor functions into the same chip. Because there were no ceramic materials that had both magnetism and the ability to function as an inductor,
Sintering and bonding layered ceramic bodies each having a tactile function or an inductance function individually, or
By firing at the same time, a chip-shaped LC composite ceramic part was formed. However, since such chip-type LC composite ceramic parts use at least two or more different materials, the manufacturing process is complicated, and furthermore, the dielectric layer and magnetic layer must be on the same surface. There were some problems. [Problems to be Solved by the Invention] The present invention solves the problems seen in the conventional chip-type LC composite ceramic parts described above, and by using a composite ceramic material having both dielectric and magnetic functions,
The purpose of this paper is to provide a chip-type LC composite ceramic component that has both capacitor and inductor functions within a single laminated ceramic substrate. [Structure of the Invention] [Means for Solving the Problems] The gist of the present invention is to provide at least one capacitor function configured by laminating an internal conductor layer and a dielectric layer;
Chip type LC with at least one inductor function
This is a chip-type LC composite ceramic component characterized by using a composite ceramic material having a dielectric constant of 20 or more and a magnetic permeability of more than 1. The composite ceramic material has a general formula M having at least one metal element M selected from the group consisting of manganese, nickel, magnesium, cobalt, copper, zinc and iron.
Ferrite represented by the composition formula F e m O a,
titanium-ugly barium B a T IO s , titanic acid t
tr P b T i O s . A mixed sintered body containing at least one dielectric compound selected from the group consisting of strontium titanate SrTiOs is preferred. [Operation] According to the present invention, in order to achieve the above object, a composite ceramic material having both dielectricity and magnetism is prepared using the general formula MFe*Oa (M is manganese, nickel, magnesium, cobalt, copper). , at least one metal element selected from the group consisting of zinc and iron)
and barium titanate B a T
sOs, lead titanate PbTiO. A multilayer ceramic body is formed using a mixed sintered body containing at least one dielectric compound selected from the group consisting of strontium titanate, SrTiOs, and strontium titanate. Therefore, we have demonstrated that it is possible to manufacture a chip-type LC composite ceramic component that has both inductor and capacitor elements by using a ceramic material that has both magnetism and inductivity as a layered body. The composite ceramic material preferably has a dielectric constant of 20 or more and a magnetic permeability of greater than 1 for the chip-type LC composite ceramic component of the present invention. That is, if the dielectric constant is less than 20, it is difficult to form a high-capacity capacitor, which is disadvantageous. If the magnetic permeability is less than 1, it is difficult to form an inductor because there is no magnetism, which is disadvantageous. This results in a composite ceramic material that is not suitable for. According to one of the chip-type LC composite ceramic component structures of the present invention, a laminated internal electrode having a capacitor function and a film-like internal conductor are formed in a composite ceramic body having both high dielectric properties and dust properties. This provides chip-type LC composite ceramic parts that can be miniaturized. In addition, the composite ceramic body is a mixture of a titanic acid dielectric material with a particle size of 30 to 120 μm and a ferrite magnetic material.
It has a structure that uses a so-called calm dielectric composite ceramic body as a substrate. The laminated composite ceramic body of the present invention includes barium titanate BaTiOm, titanium lead P
b T i O *, strontium titanate SrTi
A composition obtained by mixing at least one dielectric compound selected from the group consisting of Os and a Ni-Zn ferrite compound is used as a composite ceramic substrate. On the other hand, an inner conductor layer formed using a thick film conductor paste containing at least one metal as a main component selected from the group consisting of gold, Au%, silver, Ag, copper, and palladium, is laminated, and then a film is formed. A laminated composite ceramic body having both the functions of at least one capacitor function and at least one inductor function by arranging and firing the ceramic body is preferable. Furthermore, the material for the internal electrodes of the capacitor can be a conductive thin film material whose main component is Pd, which has good electrical conductivity, heat resistance, and weather resistance, but is not limited thereto. As for the electrode formation method, printing method etc. can be used. Both terminals of an internal electrode having a capacitor function and an inductor function according to the present invention are to be connected by forming an external electrode. There are methods to use conductive thin film surfaces formed by various methods as electrodes. The manufacturing method of the composite ceramic body parts used in the present invention is not particularly limited, but the composite ceramic material described above is formed into a ceramic sheet, printed with a conductive paste, and then laminated. Examples include a method in which a paste-like composite material and a conductive paste are printed and laminated on each other, a ceramic body is formed, and fired, and the others are not particularly limited. ．． Next, regarding the structure of the chip-type LC composite ceramic component of the present invention, Ni-Zn ferrite (Nt*.s'Z
n e. y) F e 2O4 and barium titanate BJ
Although a specific example in which LT i O s is used will be explained, the present invention is not limited by the explanation. [Example] Using N i CO *, ZnO, and Felon as starting materials, they were prepared in a molar ratio of NiO:ZnO:Fe*0.
-3:7:10, calcined at 1000°C, and further crushed to obtain (Ni.,...Zne,)Fe. o
a Obtain powder. On the other hand, BaCO. , TiO, as starting materials, the molar ratio of these is BaCOs: TiOs
They are mixed at a ratio of 1:1, calcined at about 1150°C, and then ground to obtain BaT{Os powder. Then, the obtained (N i *1Z n s.t)F
e to 4 powder Song and BaTiOs powder were mixed in a predetermined ratio, and an organic binder was added. to create a mixed paste of dielectric and magnetic materials. Then Pd or Ag/Pd
A printed layer is printed using a conductive paste such as 1, so that the desired cavastance and inductance are formed.
A laminated ceramic body was obtained by firing at about 250°C for about 4 to 10 hours. Make sure that both capacitance and inductance terminals are on the outer surface of the laminated ceramic body.
A conductive paste for external electrodes was printed or dipped on both terminals of the capacitor and inductor on the outer surface of the 114M ceramic body thus obtained.
An external electrode is formed by firing at approximately 00°C to obtain a desired chip-type LC composite ceramic part. Next, the structure of the chip-type LC composite ceramic component of the present invention will be explained. The perspective view of FIG. 1a shows a chip-type LC composite ceramic component of the present invention. The cross-sectional views taken along the A-A' plane, the B-B' plane, the c-c' plane, the D-D' plane, and the E-E' plane are shown in Figure 2 a% b% c, d, respectively. and shown in C. The equivalent circuit diagram of the chip-type LC composite ceramic component shown in Fig. 1a is shown in Fig. II1IJb. That is, in the chip-type LC composite ceramic component shown in FIG. and an electrode 4 forming an inductor. Its internal structure is shown in Figure 2a.
, b, c%d%e. That is,
The upper half of the chip-type LC composite ceramic component has a multilayer capacitor structure inside. That is, the second
As shown in the cross section shown in Figure a, external electrodes 5-1 and 5-3, respectively.
It has internal electrodes 2 and 3 connected to each other. Further, the lower half of the chip-type LC composite ceramic component is made of a composite ceramic body having an inductor structure, that is, an internal structure in which the internal conductor 4 exists in the form of a film. Then, the fill-shaped internal conductor 4 has external electrodes 5-3 and 5-2.
(Bonded.) Next, Figure 3 shows the relationship between magnetic permeability for ceramic materials made by combining various ferrites and various dielectric materials. That is, in the laminated composite ceramic body 1, Two types of internal electrodes 2 and 3 having functions are formed, and the internal electrodes 2 and 3 are joined to the external electrode 5 to form a capacitor 6 in the equivalent circuit diagram of FIG. To,
It has a structure in which an internal conductor is formed in the shape of a coil, forming the inductance 7 shown in FIG. 1b. Furthermore, external electrodes 5-1, 5-2, and 5-3 are printed and formed on the external surface of the chip-type LC composite ceramic component of the present invention,
Alternatively, it is possible to further mount a chip part, such as a transistor, to produce a composite circuit or hybrid circuit board. The type and mixing ratio of the ferrite and dielectric compound to be combined can be selected so as to minimize the size of the chip to be formed, depending on the sizes of the L and C components of the inductor and capacitor to be formed. [Effects of the Invention] The chip-type LC composite ceramic component of the present invention has the following characteristics: First, by using a composite ceramic material having dielectric properties and magnetic properties in the chip-type LC composite ceramic component, the chip-type LC composite ceramic component has the following advantages: It is possible to provide a structure that is easy to miniaturize, and secondly, it is possible to simplify the manufacturing process of chip-type LC composite ceramic parts and provide a structure that can reduce costs. The effect was obtained. 4. Explanation of m+RL of 13jff plane FIG. 1 a% b is a perspective view and an equivalent circuit diagram showing an example of the structure of the chip-type LC composite ceramic component of the present invention. Figure 2a%bse%d. e is Figure 1a
This is a cross-sectional view along each cross section shown in . FIG. 3 is a graph showing the dependence of permittivity and magnetic permeability on the composition ratio of barium titanate and various ferrites used in the chip-type LC composite ceramic component of the present invention. FIG. 4 is a graph showing the dependence of permittivity and magnetic permeability on the composition ratio of strontium titanate and various ferrites used in the chip-type LC composite ceramic component of the present invention. FIG. 5 is a graph showing the dependence of permittivity and magnetic permeability on the composition ratio of lead titanate and various ferrites. [Explanation of symbols of main parts] 1. ．． ．． ．． ．． ．． ．． ．． Composite ceramic body of ferrite and dielectric 2, 3. ．． ．． ．． ．． ．． ．． ．． Internal electrode 4. ．． ．． ．． ．． ．． ．． ．． Inductance conductor S. ．． ．．
．． ．． ．． ．． ．． External electrode《0》

Claims (2)

[Claims] (1) A chip-type LC composite component that has at least one capacitor function and at least one inductor function and is configured by laminating an internal single layer and a dielectric layer, and has a dielectric constant of 20 or more and a magnetic permeability of A chip-type LC characterized by using a composite ceramic material larger than 1
Composite ceramic parts. (2) The composite ceramic material includes ferrite represented by the general formula MFe_2O_4 having at least one metal element M selected from the group consisting of manganese, nickel, magnesium, cobalt, copper, zinc, and iron, and titanium. Barium acid BaTiO_2, lead titanate Pb
The chip-type LC composite ceramic component according to claim 1, which is a mixed sintered body containing at least one dielectric compound selected from the group consisting of TiO_2 and strontium titanate SrTiO_2.