JP2615979B2 - Frequency adjustment method for LC composite parts - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency adjusting method for an LC composite component such as a laminated resonator and a filter.

2. Description of the Related Art As the above-mentioned LC composite component, for example, an LC composite component main body in which pattern electrodes are formed on the front and back main surfaces of a dielectric layer, a sheet layer laminated on both sides thereof, and a shield electrode film further laminated on both sides Is known. This has been previously proposed by the present applicant.

However, the frequency characteristics are determined by the basic design of the inductance and capacitance of the LC composite component body, the thickness of each layer and film, and the electrical characteristics (materials). However, there is a problem that it is difficult to correct when the value does not match the design value, and since the LC composite component is generally mass-produced, discarding it increases the cost.

The present invention has been made in order to solve the problem caused by such a laminated type, and can easily adjust the frequency characteristics, and can reduce the cost. The purpose is to provide.

Means for Solving the Problems In order to achieve the above object, the present invention relates to an LC composite component including a pattern electrode formed on a main surface of a dielectric layer, and an LC composite component body including the dielectric layer and the pattern electrode. ,
A frequency adjusting method for an LC composite component, comprising: laminating a shield electrode film via a sheet layer made of a dielectric or an insulator on both surfaces of the LC composite component body, and adjusting the frequency by the thickness of the sheet layer. The layer is formed by laminating sheet films of which the film thicknesses are controlled, and the frequency is adjusted by changing the thickness of the sheet layer by changing the number of the sheet films.

The presence of a metal having high conductivity near the electronic component including the coil L increases or decreases the magnetic flux linked to the coil.
The inductance can be changed, and the center frequency of the electronic component can be changed. The degree of the frequency change depends on the distance from the metal. The frequency adjustment method of the present invention utilizes this principle, and particularly employs a shield electrode film as a metal. Furthermore, the distance between the shield electrode film and the LC composite component body is adjusted by changing the thickness of the sheet layer, and the sheet layer is formed by laminating the sheet film. The thickness of the sheet layer can be easily and accurately changed only by changing the number of films.

Embodiment 2 FIG. 2 is an external perspective view showing an LC resonator having a multilayer structure to which the present invention is applied, and FIG. 1 is a sectional view taken along the line AA ′. this
The LC resonator is formed by pattern electrodes 3 and 4 formed on the front main surface 2a and the back main surface 2b of the dielectric layer 2 located at the center in the thickness direction, and the LC resonator includes the dielectric layer 2 and the pattern electrodes 3 and 4. Shield electrode films 7, 8 are patterned and formed on the resonator body 1 via sheet layers 5, 6 formed by laminating a large number of dielectric or insulator sheet films 5a, 6a on both sides thereof. Has a laminated structure in which sheet layers 9 and 10 made of a dielectric or an insulator are also formed.
The pattern electrodes 3 and 4 are connected to the output terminal electrodes 11 and 12 (see FIG. 3).

The front main surface 2a and the back main surface 2b of the dielectric layer 2 include:
As shown in FIG. 3, pattern electrodes 3 (solid line) and 4 (dashed line) are formed in a U-shape in the opposite direction, and these pattern electrodes 3 and 4 are composed of ten capacitor electrode patterns 3a and 4a. 1 in
It has a structure in which two coil patterns 3b and 4b are connected. The capacitor electrode patterns 3a and 4a face each other in the front and back directions of the dielectric layer 2,
The capacitor C1 has a capacitance determined by the dielectric constant, thickness, and the area of the capacitor electrodes facing each other.

On the other hand, the coil patterns 3b and 4b are
Are connected through a VIA hole 2c formed so as to penetrate through. Since each of the coil patterns 3b and 4b forms a coil in terms of high frequency, when the coils are denoted by L1 and L2, the dielectric layer 2 and the pattern electrodes 3 and 4 are connected to the capacitor C1 as shown in the equivalent circuit of FIG. The resonator body 1 is constituted by connecting a coil L2 in parallel to an LC circuit in which a coil L1 is connected in series.

Sheet layers 5 and 6 are interposed between the resonator body 1 and the shield electrode films 7 and 8. This sheet layer 5,6
The thickness is adjusted by, for example, multi-layer coating of a thin sheet film 5a, 6a having a constant thickness by screen printing, and the number of coatings can be set as appropriate.

FIG. 5 is a diagram showing an example in which the thickness of a sheet film 5a, 6a having a constant thickness of 0.05 mm, for example, is 2.0 mm, 1.5 mm,
It is a graph which shows each frequency characteristic at the time of changing to 1.0 mm. In the figure, and have thicknesses of 2.0 mm and 1.5 m, respectively.
m, 1.0 mm. As can be understood from this figure, the resonance frequency of the resonator can be increased as the number of coatings is reduced and the thickness of the sheet films 5a and 6a is reduced.

Therefore, it is possible to make the frequency characteristics match the desired values by adjusting the number of coatings.

FIG. 7 is an external perspective view of a bandpass filter to which the present invention is applied, and FIG. 6 is a sectional view taken along the line AA ′. This bandpass filter has pattern electrodes 23 and 24 formed on the front main surface 22a and the back main surface 22b of the dielectric layer 22 located at the center in the thickness direction, and includes the dielectric layer 22 and the pattern electrodes 23 and 24. With respect to the bandpass filter body 21, shield electrode films 27 and 28 are pattern-formed via sheet layers 25 and 26 formed by laminating a large number of dielectric or insulating sheet films 25a and 26a on both sides thereof. It has a laminated structure in which sheet layers 29 and 30 also made of a dielectric or an insulator are formed on the outside, and input / output terminal electrodes 31 and 3 formed in concave portions on the end surfaces thereof.
2 and the ground terminal electrodes 33, 34 have the pattern electrodes 23, 2
4 are connected (see FIG. 9).

As shown in FIG. 8, four pattern electrodes 231, 232, 241, and 242 are formed in a U-shape on a front main surface 22a and a back main surface 22b of the dielectric layer 22, and the left pattern electrode 231 241 is one capacitor electrode pattern 231a, 2
The structure is such that one coil pattern 231b, 241b is connected to 41a. The capacitor electrode patterns 231a and 241a
Are opposed to each other in the front and back directions of the dielectric layer 22,
The capacitor C1 is formed, and the coil patterns 231b and 241
b is a VIA formed so as to penetrate the dielectric layer 22 respectively.
The connection is made via a hole 22c.

The right pattern electrodes 232 and 242 also have one coil pattern 232b and 242b on one capacitor electrode pattern 232a and 242a.
Are connected. The capacitor electrode patterns 232a and 242a are opposed to each other in the front and back directions of the dielectric layer 22 to form a capacitor C2, and the coil patterns 232b and 242b are formed to penetrate the dielectric layer 22 respectively. It is connected via a hole 22d.

The tongue piece 231c formed by projecting the middle of the coil pattern 231b above the left side and the tongue piece 242c formed by projecting the middle of the coil pattern 242b below the right side sandwich the dielectric layer 22 therebetween. They face each other to form a capacitor C3. Therefore, the coil patterns 231b and 242b
A coil divided into two is formed by 231c and 242c.

One of the coil patterns 231b thus divided into two is L1, the other is L2, and one of the coil patterns 242b is L4, the other is L5, and the other two coil patterns are 231b.
Assuming that 241b and 232b are L3 and L6, respectively, the dielectric layer 22 and the pattern electrodes 231, 241, 232, and 242 are formed by connecting the coils L1, L2, and L3 in series with the capacitor C1, as shown in the equivalent circuit of FIG. And the coil L for the capacitor C2
A band-pass filter body 21 is formed by connecting a resonator formed by connecting 4, L5, L6 in series with the capacitor C3.

The band-pass filter body 21 and the shield electrode film 2
Sheet layers 25 and 26 are interposed between the layers 7 and 28. The sheet layers 25 and 26 are formed by, for example, screen printing, and the thickness is adjusted by multi-layer coating of thin sheet films 25a and 26a having a constant thickness, and the number of coatings can be appropriately set. .

FIG. 10 shows a sheet film 25a, 26a having a constant thickness of, for example, 0.05 mm.
The thickness by multi-layer coating, for example, 2.0mm, 1.5m
6 is a graph showing frequency characteristics when m and 1.0 mm are changed. In the figure, and indicate thicknesses of 2.0 mm and 1.5 mm, respectively.
mm, 1.0 mm. As understood from this figure,
The center frequency of the bandpass filter can be increased as the number of coatings is reduced and the thickness of the sheet films 25a and 26a is reduced.

Therefore, it is possible to make the frequency characteristics match the desired values by adjusting the number of coatings.

In the above embodiment, the sheet films 25a and 26a have a constant thickness of 0.05 mm.
mm, 1.0 mm, the thickness of the sheet layer is 0.05 mm
If it does not become an integral multiple of the above, the thickness of the sheet layer is adjusted using a thickness that makes the integral multiple. However, in the case of screen printing, there is a limit to the thickness that can be applied at one time, and therefore, it is necessary that this thickness is set to a level that does not hinder the formation of the film.

Further, the formation of the sheet layer is not limited to the screen printing, and a thin green sheet having a constant thickness for a sheet film may be stacked.

Further, the sheet layer can be formed by a method of forming the sheet layer using only one sheet layer having a desired thickness, instead of a method of laminating many thin sheet films.

Effect of the Invention As described above in detail, in the case of the present invention, the thickness of the sheet layer interposed between the LC composite component main body and the shield electrode film is changed by changing the number of sheet films, and the frequency of the LC composite component is changed. Therefore, the frequency characteristics can be easily and accurately adjusted without changing the basic design of the LC composite component body. Conventional techniques suggesting adjustment of frequency characteristics include the invention described in JP-A-63-299607 and the invention described in JP-A-61-189716. JP 63
The invention described in -299607 discloses a surface mount bandpass filter having a bandpass filter body, a printed circuit board, and a metal cover, and changing the distance between the metal cover and the bandpass filter body at a product stage. A surface mount bandpass filter that can fine-tune the frequency characteristics by fixing it is shown. However, such a configuration has a problem that it is difficult to precisely finely adjust the distance between the bandpass filter main body and the metal cover. The invention described in Japanese Patent Application Laid-Open No. 61-189716 discloses a shield device having an insulating substrate between a printed coil and a shield electrode. Further, the distance between the printed coil and the shield electrode is kept constant by the insulating substrate. 2 shows a shield device that controls the inductance value of the print coil to be constant by setting the value of the shield coil. However, there is a problem that it is difficult to change the thickness of the insulating substrate in order to adjust the frequency. On the other hand, in the present invention, the thickness of the sheet layer is changed by changing the number of the sheet films, so that the frequency can be easily and accurately adjusted. Further, since the frequency can be easily and accurately adjusted, the frequency can be adjusted between lots at the time of mass production, and the cost can be reduced by reducing defective products.

[Brief description of the drawings]

1 is a cross-sectional view taken along the line AA 'of FIG. 2, FIG. 2 is an external perspective view of the resonator to which the present invention is applied, FIG. 3 is a plan view of a resonator main body, and FIG. FIG. 5 is a graph showing the frequency characteristics of the resonator adjusted according to the present invention, FIG. 6 is a sectional view taken along the line AA 'of FIG. 7, and FIG. 7 is a band pass to which the present invention is applied. Eighth perspective view showing the appearance of a filter.
FIG. 9 is a plan view of the bandpass filter main body, FIG. 9 is an equivalent circuit diagram of the bandpass filter main body, and FIG. 10 is a graph showing the frequency characteristics of the bandpass filter adjusted according to the present invention. 1, resonator body 2, dielectric layer 3, 4, pattern electrode 5, 6, sheet layer, 5a, 6a sheet film, 7, 8
Shield electrode film, 21 …… Band pass filter body, 22…
... dielectric layer, 23, 24 ... pattern electrode, 25, 26 ... sheet layer, 25a, 26a ... sheet film, 27, 28 ... shield electrode film.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-151007 (JP, A) JP-A-59-223011 (JP, A) JP-A-62-234409 (JP, A)

Claims (1)

(57) [Claims] An LC composite component having a pattern electrode formed on a main surface of a dielectric layer and an LC composite component body including the dielectric layer and the pattern electrode. A frequency adjustment method for an LC composite component in which a shield electrode film is laminated via a sheet layer made of an insulator and the frequency is adjusted according to the thickness of the sheet layer, wherein the sheet layer has a thickness controlled sheet film. A frequency adjusting method for an LC composite component, wherein the frequency is adjusted by changing the number of the sheet films to change the thickness of the sheet layer.