JPH02256210A - Regulating method for frequency of electronic component including inductor - Google Patents

Abstract

PURPOSE:To prevent a shielding electrode film from cracking from a trimming hole or a pattern electrode from oxidizing by regulating a frequency by trimming the film. CONSTITUTION:First sheet layers 6, 7 made of dielectric or insulator, shielding electrode films 8, 9 and second sheet layers 10, 11 made of dielectric or insulator are sequentially formed from a body 5 of a band pass filter on both side faces of the body 5. When the central frequency of the filter is regulated, the film 8 is trimmed. Thus, since the area of the film 8 is reduced, magnetic influence of a coil pattern is reduced, the inductance of a coil pattern is increased, it can be trimmed without considerably increasing the output of trimming. Accordingly, it can suppress crack of the filter. Since the electrodes 3, 4 are not exposed, it can prevent the electrodes 3, 4 from oxidizing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a frequency adjustment method for electronic components including inductors such as resonators and filters.

An example of an electronic component including a distortion inductor is a bandpass filter 51 as shown in FIG. This band-pass filter 51 has a patterned electrode 53 formed on both the front and back sides of a dielectric layer 52, and on this patterned electrode 53, a first sheet layer 54, a shield electrode film 5, a sheet layer 54, and a shield electrode film 5 are formed in order from the electrode 53 side.
5 and a second sheet layer 56 are laminated.

By the way, the frequency characteristics of the bandpass filter 510 (
The center frequency) needs to be the same as the design value, but may differ from the design value depending on the environment during the manufacturing process.

Conventionally, therefore, the center frequency of the bandpass filter 51 was adjusted by trimming the pattern electrode 53 inside the laminate.

However, in the conventional method described above, the distance between the surface of the bandpass filter 51 (the surface of the second sheet Ji 56) and the pattern electrode 53 is large (that is, the trimming hole 57 is deep), so the output during trimming is It is necessary to raise it. For this reason, cracks may occur from the trimming holes.

In addition, since the pattern electrode 53 is exposed in the trimming hole, the pattern electrode 53 may be oxidized.

For these reasons, there was a problem in that the characteristics of the bandpass filter 51 deteriorated.

Therefore, the present invention was made in consideration of the above-mentioned problems, and dramatically improves the characteristics of electronic components including inductors by preventing cracks from occurring from trimming holes and oxidation of pattern electrodes. The purpose of the present invention is to provide a method for adjusting the frequency of electronic components including transparent inductors.

In order to achieve the above object, the present invention includes a patterned electrode forming an inductor on at least one surface of a dielectric layer, and a first sheet layer and a first sheet layer formed on this patterned electrode in order from the patterned electrode side. A method for adjusting the frequency of an electronic component including an inductor in which a shield electrode film and a second sheet layer are formed, characterized in that the frequency is adjusted by trimming the shield electrode film.

North-U With the above configuration, the distance between the shield electrode film and the surface of the electronic component is smaller than the distance between the pattern electrode and the surface of the electronic component. Therefore, since trimming can be performed without increasing the trimming output too much, occurrence of a crank in the bandpass filter can be suppressed.

In addition, since the pattern electrode is not exposed, it is possible to prevent the pattern electrode from being oxidized.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

FIG. 1 is an external perspective view of a bandpass filter to which the present invention is applied, and FIG. 2 is a cross section taken along line nn in FIG. 1. This bandpass filter has a main body portion 5 consisting of a dielectric N2 and pattern electrodes 3 and 4 formed on both the front and back surfaces of this dielectric layer 20. On both sides of the main body part 5, first sheets N6 and 7 made of a dielectric or an insulator, shield electrode films 8 and 9, and second sheet layers 10 and 11 made of a dielectric or an insulator are provided. They are formed in order from the 5th side. Furthermore, an input terminal electrode 13, an output terminal electrode 14, and ground electrodes 15 and 16 are formed on both sides of the bandpass filter.

As shown in FIG. 3, the pattern electrode 3 is composed of a substantially U-shaped pattern electrode 31 and an oval-shaped pattern electrode 32, while the pattern electrode 4 is composed of an oval-shaped pattern electrode 41 and an oval-shaped pattern electrode 32. It is composed of a substantially U-shaped pattern electrode 42. The above four pattern electrodes 31, 32, 41,
42, the pattern electrodes 31 and 41 on the left side in the figure have a structure in which a coil pattern 31b (Ll, Lz) or a coil pattern 41b (L3) is connected to one capacitor electrode pattern 31a, 41a (C+), respectively. The capacitor electrode patterns 31a and 41a face each other in the front and back directions of the dielectric layer 2, and the coil patterns 31b and 41b are connected via a VIA hole 21a penetrating the dielectric layer 2. Furthermore, the tongue piece 31c formed at the end of the pattern electrode 3 is connected to the output terminal electrode 14, and the tongue piece 31d formed at the end of the pattern electrode 3 is connected to the earth electrode 15.

On the other hand, the pattern electrodes 32 and 42 on the right side are one capacitor electrode pattern 32a and 42a (Cz) in the same manner as above.
A coil pattern 32b (L6) or a coil pattern 42b (L4, Ls) is connected to each of the coil patterns 32b and 42b, and the coil patterns 32b and 42b are connected via a VIA hole 21b penetrating the dielectric layer 2. Further, the tongue piece 32c formed at the end of the pattern electrode 3 is connected to the ground electrode 16, and the tongue piece 41c formed at the end of the pattern electrode 4 is connected to the input terminal electrode 13. Further, the tongue piece 31e formed on the inside of the pattern electrode 31 and the tongue piece 42e formed on the inside of the pattern electrode 42 face each other with the dielectric N2 in between, thereby forming a capacitor C3. ing.

With the above structure, a bandpass filter as shown in the equivalent circuit of FIG. 4 is constructed.

Here, when adjusting the center frequency of the bandpass filter, the shield electrode film 8 is trimmed as shown in FIGS. 5 and 6.

In this case, the area of the shield electrode film 8 decreases, so
The magnetic influence on the coil pattern is small (and the inductance of the coil pattern is large). Therefore, as shown in FIG. 7, the center frequency of the bandpass filter is lowered.

At this time, since the distance between the shield electrode films 8 and 9 and the surface of the bandpass filter is 20 to 40 pm, the depth of the trimming hole 45 may be about 50 μm. Therefore, since trimming can be performed without increasing the trimming output too much, occurrence of a crank in the bandpass filter can be suppressed. In addition, since the pattern electrodes 3 and 4 are not exposed, it is possible to prevent the pattern electrodes 3 and 4 from being oxidized.

Incidentally, if the diameter of the trimming hole 45 is made too large, the shielding effect will deteriorate, so it is necessary to set the diameter to an extent that does not deteriorate the shielding effect.

Also, in the above embodiment, trimming was performed at six locations, but the invention is not limited to this, and if the center frequency does not shift too much, the number of trimmings may be reduced.
If the center frequency deviates significantly, it is possible to adjust by increasing the number of trimmings.

As explained above, according to the present invention, trimming is possible without increasing the trimming output too much.
Cracks can be suppressed from occurring in the bandpass filter. In addition, since the pattern electrode is not exposed, it is possible to prevent the pattern electrode from being oxidized.

For these reasons, it is possible to dramatically improve the characteristics of electronic components including inductors.

[Brief explanation of drawings]

Fig. 1 is an external perspective view of the bandpass filter, Fig. 2 is a sectional view taken along line nn in Fig. 1, Fig. 3 is a plan view of the bandpass filter main body, and Fig. 4 is an equivalent circuit diagram of the bandpass filter. , FIG. 5 is a perspective view of the appearance of the bandpass filter in FIG. 1 after frequency adjustment, FIG. 6 is a sectional view taken along the line Vl-Vl in FIG. 5, and FIG. 7 is a bandpass filter adjusted according to the present invention. FIG. 8, a graph showing the frequency characteristics of the filter, is a cross-sectional view when frequency adjustment is performed using a conventional method. Fig. 1 2--Dielectric layer, 3, 4, pattern electrode, 6, 7
...First sheet layer, 8, 9... Shield electrode film, 1
011...Second sheet layer, 45...Trimming hole. Patent applicant 2 Murata Manufacturing Co., Ltd.

Claims (1)

[Claims] (1) A patterned electrode constituting an inductor is formed on at least one surface of the dielectric layer, and a first sheet layer, a shield electrode film, and a second sheet layer are formed on this patterned electrode in this order from the patterned electrode side. A method for adjusting the frequency of an electronic component including an inductor, characterized in that the frequency is adjusted by trimming the shield electrode film.