JPH0388311A - Electronic part and method for adjusting electric characteristic of same part - Google Patents

Abstract

PURPOSE:To prevent risks of breakdown and the like of elements formed in a laminated body and to perform the adjusting steps for electric characte-ritics simply by trimming conductors which are formed on the side surface of the laminated body and can be cut out, or forming conductors on the side surface of the laminated body, and adjusting the characteristics of an electronic part. CONSTITUTION:Intermediate external lead-out terminals 14 are electrically connected to parts of electronic elements formed with conductor patterns 12 and taken out of the side surface of a laminated body 2. The parts of or all of the intermediate external lead out terminals 14 are connected with conductors which can be cut out. When the parts of or all of the intermediate external lead-out terminals 14 are connected with the conductors which can be cut out and the conductors which can be cut out are trimmed, the electric characteristics of the electronic part are adjusted. Therefore, there is no risk of breakdown and the Iike in the internal elements, and the electric characteristics can be adjusted very safely and simply.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to so-called electronic components such as laminated chip inductors and laminated composite LC chips, and particularly to the structure of such electronic components and a method for adjusting their electrical characteristics.

[Prior Art] Conventionally, as a method for trimming the inductance of so-called electronic components such as a multilayer chip inductor and a multilayer composite LC chip, for example, a method for trimming the inductance of a multilayer composite LC chip,
As shown in Publication No. 048, after forming a laminated composite element by laminating a plurality of magnetic sheets each having a conductive pattern formed on its surface, a part of the magnetic substance of the inductance element of the laminated composite element is scraped off. A method is known in which the cross-sectional area through which magnetic flux passes is reduced to reduce the inductance value, thereby adjusting the electrical characteristics of the element.

C Problems to be Solved by the Invention] However, in the above-described conventional method for adjusting electrical characteristics of electronic components, adjustment is performed by scraping off a part of the magnetic material constituting the laminate. Unless trimming is performed after extremely accurate determination, there is a problem in that there is a risk that the internal electrodes will be exposed or damaged due to trimming.

Therefore, in view of the above-mentioned problems in the prior art, the present invention aims to eliminate the risk of exposing internal electrodes or damaging elements due to trimming even when performing F1 adjustment of the electrical characteristics of electronic components. An object of the present invention is to provide an electronic component and a method for adjusting its electrical characteristics.

[Means for Solving the Problems] In order to achieve the above object, the gist of the means adopted in the present invention is as follows: First, a plurality of ceramic sheets each having a conductive pattern formed on its surface are In an electronic component formed by a conductive pattern, the electronic component is laminated so as to be electrically connected to each other, and an external connection terminal for electrically connecting an electric element constituted by the conductive pattern to the outside is formed in a part of the laminated body. It is an electronic component in which an intermediate external terminal that is electrically connected to a part of the electrical element that has been removed is taken out to the side of the laminate, and a part or all of the intermediate external terminal is connected to each other with a removable conductor. .

In this case, the intermediate external extraction terminal taken out on the side surface of the laminate may be exposed in a groove formed on the side surface of the laminate.

Second, using the above electronic component, a part or all of the intermediate external output terminals are connected to each other with a removable conductor, and the electrical characteristics of the electronic component are adjusted by trimming the removable conductor. be.

Thirdly, there is a method of adjusting the electrical characteristics of an electronic component using the above electronic component and connecting some or all of the intermediate external terminals to each other with a conductor.

In this case, it is desirable to cover the trimmed portion of the removable conductor with an insulating material, and a groove is formed on the side surface of the laminate along the taken out intermediate external terminal, and the portion inside the groove can be removed. The above insulating material may be formed with a conductor.

[Function] According to the electronic component and the method for adjusting its electrical characteristics, the characteristics of the electronic component can be adjusted by trimming the removable conductor formed on the side surface of the laminate or by forming the conductor on the side surface of the laminate. Since the adjustment is performed, there is no risk of damaging the elements configured inside the laminate. Further, since it is only necessary to cut out the conductor on the side surface of the laminate or form the conductor on the side surface of the laminate, the process of adjusting the electrical characteristics can be carried out very easily.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an electronic component according to an embodiment of the present invention, more specifically, a so-called laminated L-chip I in which an inductance element is formed inside a laminated body. As is clear from the figure, this laminated L chip l is a laminated body 2 made by laminating ceramic magnetic sheets on which a spiral electrode pattern for forming an inductance L is printed on the surface of the laminated L chip l.
Further, a short-circuiting external electrode 3 is formed on the side surface of the short-circuiting external electrode 3, and then the shorting external electrode 3 is removed by, for example, laser trimming to adjust its electrical characteristics. Further, reference numeral 4.4 in the figure is formed on a side surface of the laminated L chip 1 opposite to the surface on which the shorting external electrode 3 is formed, and is formed by the spiral conductive pattern inside the laminated body 2. An external connection terminal for electrically connecting the electrical element (namely, inductance L) to the outside, and reference numeral 5 denotes a groove formed to provide the short-circuiting external electrode 3 on the side surface of the laminate 2; And code 6
is an insulating material, that is, an insulating coating material, applied to the groove 5 after the shorting external electrode 3 provided in the groove 6 was removed by laser trimming.

A specific example of the method for manufacturing the electronic component described above will be described in detail below with reference to FIG. 2. First, a slurry is prepared by mixing a magnetic material mainly composed of ferrite with a binder mainly composed of polyvinyl butyral. This slurry is formed into a sheet by, for example, a doctor blade method. Subsequently, so-called through holes 11, 11, . . . are provided at predetermined positions of the magnetic green sheets 10, 10, .

Next, magnetic green sheet 1 produced in this way
As shown in FIG. 2, conductor patterns 12, 12, . . . are printed on the surfaces of 0.10, . When forming an inductance L, this printed conductor pattern is used as a substantially U-shaped conductor pattern 12, 12, as seen in the second to sixth sheets from the top.・・・
are printed and stacked one after another to form a laminate 2, and the conductor patterns 12, 12... of each layer are formed into through holes 11.
, 11 . . . to form a spiral electrode inside. Further, on the surfaces of the second sheet and the second to last sheet, which serve as both ends of the spiral electrode, the conductor pattern 12. 12 is printed by extending it to the end surface of the magnetic material Green Sea) 10 (indicated by 12'12').

According to the present invention, on the surface of the magnetic green sheets 10 that are laminated to form the inductance L,
In addition to the substantially U-shaped conductive patterns 12, 12, . . . for forming the inductance L, these conductive patterns 12, 12, . . . , the front in the figure), so-called intermediate external extraction terminals 14, 14, . . . are formed.

Magnetic material green sea formed as above) 10.1
As shown in Fig. 2, 0... is laminated in a predetermined order, and above and below the magnetic material Green Sea) 15.15 with a certain thickness is layered, and this is heated at 120°C. It is crimped with a pressure of 500 kg/cm" and cut into a predetermined shape to obtain a laminate 2 as shown in FIG.
The above conductor pattern 12.12 formed on the surface of .
FIG. 5 shows how the spiral electrodes are formed. In this embodiment, the groove 5 is formed by cutting the side surface of the laminate 2 shown on the front side in FIG. 3, that is, the side surface where the intermediate external terminals 14, 14... are doing.

Thereafter, this laminate is fired in the atmosphere at 900"C for about 1 hour, and as shown in FIG.
In this embodiment, conductive paste is applied to the left and right surfaces in the figure. Furthermore, a conductive paste similar to that used for forming the external connection terminals 4.4 is applied to the groove 5 formed on the side surface of the laminated L-chip 1, and as shown on the right side of the figure, the intermediate external connection terminal 4. The so-called short-circuit external electrode 3, which connects all the terminals 14, 14, and short-circuits them, is formed.

This is then baked in the atmosphere at a temperature of 600° C. for about 10 minutes to obtain the laminated L-chip 1 shown in FIG. In this way, the conductive patterns 12, 12...
A laminated L-chip l is obtained which is equipped with external connection terminals 4.4 for electrically connecting the internal electrodes formed in step 1 to the outside. An electrical equivalent circuit of this laminated L-chip 1 is shown on the right side of the figure.

Electrical characteristics of the laminated L chip l obtained as above,
That is, the inductance L is determined by connecting the external connection terminals 4.4 at both ends of the laminated L chip 1 to a measuring device and measuring the inductance value.
The short-circuiting external electrode 3 for trimming formed in the groove 5 on the side surface is gradually removed from the bottom end using, for example, a laser. Trimming is then stopped when the measured inductance value falls within a predetermined standard.

By this trimming, the short-circuiting external electrode 3 is removed, and the surface of the groove 5 where the intermediate external extraction terminals 14, 14, etc. are exposed is coated with epoxy resin as an insulating material 6, and then laminated as shown in FIG. Complete L chip l. The equivalent circuit of the laminated L-chip 1 completed in this manner is shown on the right side of the figure for reference.

The range of adjustment of this inductance is expressed as follows, assuming that the inductance value at the number of turns is Ll and the coefficient is A, since inductance is proportional to the square of the number of turns.

L n ” A n ” (1
) Therefore, Ln++/Ln= (n+ 1) 2/n”
It is expressed as (2). In other words, the greater the number of turns, the more fine adjustment of inductance becomes possible, and especially in the laminated L chip l of the present invention, as shown in the graph of FIG.
In a coil whose number of turns is 22 or more, the inductance value can be adjusted within ±10%.

7 and 8 show an electronic component according to another embodiment of the present invention, more specifically, a so-called laminated composite LC chip 1' in which an LC circuit is formed inside a laminated body. There is. As is clear from the figure, this laminated composite LC chip 1' is made up of laminated dielectric or magnetic ceramic sheets to1 to...on which electrode patterns for forming a capacitor C and an inductance L are printed. In the figure, the same components as in the embodiment shown in FIGS. 1 to 5 are given the same reference numerals.

In addition, as for the manufacturing method of the above-mentioned electronic components, as shown in Fig. 8, the magnetic material or dielectric material
A conductor pattern is printed on the surface of the dielectric green sheets 10, 10, . - As seen in the second and third sheets from the top, a rectangular conductive pattern 13.13 is printed almost in the center, and these conductive patterns face each other with the dielectric green sheet 10 in between. It is formed by overlapping. Otherwise, the method of forming the inductance L is the same as that shown in FIG. 2 above.

A substantially U-shaped conductor pattern 12, 12, . . .
In addition, so-called intermediate external extraction terminals 14, 14, . . . for extracting these conductive patterns 12, 12, . The intermediate external extraction terminal 14.1 is provided on the side surface of the laminate 2.
After forming short-circuit external electrodes 3 for trimming to connect 4..., connect the external connection terminals 4.4 at both ends of the laminated composite LC chip 1' to a measuring instrument to measure the frequency-gain characteristics. However, in the above embodiment, the trimming short-circuiting external electrode 3 formed in the groove 5 on the side surface of the laminated composite LC chip 1' may be gradually removed from the bottom end using a laser to adjust its electrical characteristics. It is similar to

Adjustment of the electrical characteristics of such a laminated composite LC chip 1',
Taking a parallel resonant trap as an example in particular, its resonant frequency f is given by the following equation.

f=1/2r/T (3) Here, L is an inductance value and C is a capacitance value. The rate of change in the resonant frequency f by changing the inductance by ±10% is fL (1±0.1)/f L =2yrf/2zJL (1±0.1)C=1/
rl±0. 1=0. 953 or =1.054 (4) From this, approximately ±0. It can be seen that adjustment of 5% is possible.

In the embodiments described above, when adjusting the electrical characteristics, conductive patterns 12.
12... Intermediate external extraction terminal 14.14
... are all short-circuited using the short-circuit external electrode 3 for trimming, and then the short-circuit external electrode 3 is removed to adjust the inductance L, but the present invention is not limited to this method. For example, while measuring the characteristics of the chip, the intermediate external terminal 14 is taken out from the side surface of the laminate.
14... may be sequentially connected to form the short-circuiting external electrode 3 so as to have a predetermined characteristic value. Furthermore, it is clear that the groove 5 on the side surface of the laminate in which the shorting external electrode 3 is formed does not necessarily have to be formed, and the same effect can be obtained even if the shorting external electrode 3 is formed directly on the side surface of the laminate. Will.

[Effects of the Invention] As is clear from the above explanation, according to the present invention, there is no danger of damaging internal elements, and electrical characteristics can be adjusted extremely safely and easily. We can provide electronic components and methods for adjusting them.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the overall structure of a laminated L-chip according to an embodiment of the present invention, FIGS. 2 to 5 are exploded views and perspective views showing the process of manufacturing the laminated L-chip, and FIG. 6 is a graph showing the relationship between the number of turns of the inductance of the laminated L chip and the degree of adjustment, and FIGS. 7 and 8 show the overall structure and manufacturing process of a laminated composite LC chip according to another embodiment of the present invention. FIG. 2 is an overall perspective view and a developed view. l...Laminated L chip 2...Laminated body 3...External electrode for short circuit 4...External connection terminal 5...Groove 6.
...Insulating material 10...Green Sea) 11...
Through hole 12... Conductor pattern 12'...
- End face extension of conductor pattern 14... Intermediate external extraction terminal 15... Upper and lower green sheets 13... Rectangular conductor pattern

Claims (6)

[Claims] (1) A plurality of ceramic sheets each having a conductive pattern formed on its surface are laminated so that the respective conductive patterns are electrically connected, and an electric element constituted by the conductive pattern is provided in a part of the laminated body. In an electronic component that has an external connection terminal for electrically connecting to the outside, an intermediate external terminal that is electrically connected to a part of the electrical element formed by the conductive pattern is taken out on the side of the laminate. Electronic components featuring: (2) The electronic component according to claim 1, wherein the intermediate external lead-out terminal taken out on the side surface of the laminate is exposed in a groove formed on the side surface of the laminate. (3) A plurality of ceramic sheets each having a conductive pattern formed on its surface are laminated so that the respective conductive patterns are electrically connected, and an electric element constituted by the conductive pattern is provided in a part of the laminated body. In a method for adjusting the electrical characteristics of an electronic component formed with an external connection terminal for electrically connecting to the outside, an intermediate external extraction terminal electrically connected to a part of an electrical element formed by a conductive pattern is used. Electrical characteristics of an electronic component, characterized in that using electronic components taken out from the side surface of a laminate, part or all of the intermediate external output terminals are connected to each other with a removable conductor, and the removable conductor is trimmed. Adjustment method. (4) A plurality of ceramic sheets each having a conductive pattern formed on its surface are laminated so that the respective conductive patterns are electrically connected, and an electric element constituted by the conductive pattern is provided in a part of the laminated body. In a method for adjusting the electrical characteristics of an electronic component formed with an external connection terminal for electrically connecting to the outside, an intermediate external extraction terminal electrically connected to a part of an electrical element formed by a conductive pattern is used. 1. A method for adjusting electrical characteristics of an electronic component, which comprises using an electronic component taken out from a side surface of a laminate, and connecting some or all of the intermediate external terminals to each other with a conductor. (5) In claim 3 or 4,
A method for adjusting the electrical characteristics of electronic components in which the exposed intermediate external terminal is covered with an insulating material. (6) In any of claims 3 to 5,
A method for adjusting electrical characteristics of an electronic component, in which a groove is formed in a side surface of a laminate in which an intermediate external terminal is exposed, and a conductor connecting the intermediate external terminal and an insulating material covering the conductor is formed in the groove.