JPH0837404A - Laminated filter and manufacturing method thereof - Google Patents

Abstract

PURPOSE:To improve the job efficiency performance by preventing the reduction in the yield due to improper adjustment for a frequency band. CONSTITUTION:The filter is made up of a filter main body 35 formed by laminating ceramic sheets 11, 13, 15, 19, 21 made of plural dielectric materials. A bypass input/output electrode 25 and a bypass ground electrode 26 connected electrically to an input/output electrode 25 and ground electrodes 22, 24 are provided to end parts of the ceramic sheet 21 and marks 27-30 are provided to the ceramic sheet 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated filter used for communication equipment and the like and a method for manufacturing the same.

[0002]

2. Description of the Related Art A conventional technique will be described below with reference to the drawings.

FIG. 6 is an exploded perspective view of a conventional laminated filter. As shown in FIG. 6, the laminated filter comprises a filter body 15 formed by laminating ceramic sheets 1, 3, 5, 9, 11 made of a plurality of dielectrics. The lower shield electrode 2 is provided on the ceramic sheet 1, the interstage coupling electrode 6, the input / output coupling electrode 7 and the frequency adjusting electrode 8 which are internal electrodes are provided on the ceramic sheet 3, and the strip line 4 is provided on the ceramic sheet 5. The ceramic sheet 9 is provided with the upper shield electrode 10. The lower shield electrode 2, the upper shield electrode 10, the strip line 4, and the frequency adjusting electrode 8 are electrically connected to the earth electrodes 12 and 14 which are external electrodes provided on the outer peripheral surface of the filter body 15. Further, the input / output coupling electrode 7, the lower shield electrode 2, and the upper shield electrode 10 are electrically connected to the input / output electrode 13 which is an external electrode provided on the outer peripheral surface of the filter body 15.

[0004]

In the above structure, when the frequency band of the laminated filter is to be finely adjusted, it is adjusted by cutting A or B of the ceramic sheet 11 on the upper surface of the filter body 15 corresponding to the strip line 4. To do. At this time, the increase / decrease in the bandwidth of the frequency band changes depending on which of A and B is cut, so it is necessary to always consider the directionality of the laminated filter. However, since the shape of the laminated filter is rectangular or square, its directionality cannot be easily discriminated. As a result, if the directionality is incorrect, there is a problem in that work efficiency is poor, such as poor adjustment and yield loss. Had.

The present invention solves the above problems,
An object of the present invention is to provide a laminated filter in which the yield of the laminated filter is prevented from being lowered due to a poor adjustment of the frequency band and the work efficiency is improved without making a mistake in the directionality of the laminated filter.

[0006]

In order to achieve the above object, in a laminated filter of the present invention, a filter body formed by laminating a plurality of dielectrics is provided, and a filter body is provided between the laminated dielectrics of the filter body. And a strip line and an internal electrode, and an external electrode electrically connected to the strip line and the internal electrode and provided on an outer peripheral surface of the filter body, and a mark is provided on an upper surface of the filter body. .

Further, the manufacturing method includes a plurality of dielectrics,
A first step of forming a filter body by laminating a stripline and a dielectric provided with an internal electrode on at least one of the dielectrics, and an outer peripheral electrode electrically connected to the stripline and the internal electrode The second step is to provide the outer peripheral surface of the filter body, and the first step has a step of providing a mark on the dielectric on the upper surface of the filter body.

[0008]

With the above structure, since the mark is provided on the dielectric on the upper surface of the filter body, the directionality of the laminated filter can be easily discriminated, and it corresponds to the strip line when the frequency band is finely adjusted. The top surface of the ceramic sheet can be cut accurately. As a result, it is possible to prevent poor adjustment, prevent a decrease in yield, and improve work efficiency.

[0009]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view of a laminated filter according to a first embodiment of the present invention, FIG. 2 is a perspective view of the laminated filter, and FIG. 3 is a top view of the laminated filter.

The laminated filter as shown in FIGS.
Ceramic sheets 11, 13, 1 composed of a plurality of dielectrics
The filter main body 35 is formed by laminating 5, 19, and 21. The lower shield electrode 1 is provided on the ceramic sheet 11.
2, the ceramic sheet 13 has an inter-stage coupling electrode 16 and an input / output coupling electrode 17 and a frequency adjusting electrode 18 which are internal electrodes, the ceramic sheet 15 has a strip line 14, and the ceramic sheet 19 has an upper shield. An electrode 20 is provided. Also, the lower shield electrode 1
2, the upper shield electrode 20, the strip line 14, and the frequency adjusting electrode 18 are electrically connected to the earth electrodes 22 and 24 which are external electrodes provided on the outer peripheral surface of the filter body 35. Further, the input / output coupling electrode 17, the lower shield electrode 12, and the upper shield electrode 20 are the filter main body 35.
Is electrically connected to the input / output electrode 23 which is an external electrode provided on the outer peripheral surface of the. Further, the ceramic sheet 21 has an input / output electrode 23 and ground electrodes 22, 24 at its ends.
The wraparound input / output electrode 25 and the wraparound earth electrode 26 electrically connected to the
0 is provided.

The characteristics of the laminated filter having the above structure will be described below. When finely adjusting the frequency band of the laminated filter, as shown in FIG. 3, since the mark 27 or the mark 29 is provided on the ceramic sheet 21 which is the upper surface of the laminated filter, the direction of the filter body 35 can be discriminated. A or B of the ceramic sheet 21 corresponding to the strip line 14 provided in
Can be cut accurately. As a result, it is possible to prevent poor adjustment, prevent a decrease in yield, and improve work efficiency.

As described above, in the first embodiment, the mark 27
Alternatively, by discriminating the direction of the filter main body 35 by the mark 29, A or B for finely adjusting the frequency band of the laminated filter can be precisely cut, a decrease in yield can be prevented, and work efficiency can be improved. You can

Embodiment 2 Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 4 is a top view of the laminated filter in the second embodiment of the present invention, and FIG. 5 is a perspective view of the laminated filter.

The laminated filter in the second embodiment is the first
The mark 27 or the mark 29 provided on the upper surface of the filter body 35 is substantially the same as the laminated filter in the embodiment.
Is set to a position corresponding to the strip line 14 provided on the ceramic sheet 15, and the mark 28 or the mark 3 is formed.
This is a configuration in which 0 is provided.

With the above structure, the mark 28 or the mark 30 can be visually recognized.
By trimming 0, it is possible to precisely trim A or B for finely adjusting the frequency of the laminated filter, and to finely adjust the frequency of the laminated filter while further strengthening the effect of the first embodiment. You can

As described above, in the second embodiment, the mark 28
Alternatively, since the mark 30 is visible, it is possible to precisely remove A or B for finely adjusting the frequency of the laminated filter by shaving the mark 28 or the mark 30. Thus, the effect of the first embodiment can be obtained. It can be further strengthened.

(Third Embodiment) A third embodiment of the present invention will be described below with reference to the drawings.

The third embodiment is a method of manufacturing the laminated filter in the first embodiment. In the first step, a ceramic sheet 11 provided with an interstage coupling electrode 16, an input / output coupling electrode 17, and a frequency adjustment electrode 18 is laminated on a ceramic sheet 11 provided with a lower shield electrode 12, and this ceramic is laminated. A ceramic sheet 15 provided with a strip line 14 is laminated on the sheet 13, a ceramic sheet 19 provided with an upper shield electrode 20 is laminated on the ceramic sheet 15, and on the ceramic sheet 19,
This is a step of forming the filter body 35 by laminating the ceramic sheets 21. The second step is the lower shield electrode 1
2, the upper shield electrode 20, the strip line 14, the ground electrode 2 for electrically connecting the frequency adjusting electrode 18
2 and 24 are provided on the outer peripheral surface of the filter body 35, and the input / output electrode 2 for electrically connecting the input / output coupling electrode 17, the lower shield electrode 12, and the upper shield electrode 20.
3 is a step of providing the outer peripheral surface of the filter body 35. At this time, in the first step, the wraparound input / output electrode 25 and the wraparound ground electrode 26 for electrically connecting to the input / output electrode 23 and the ground electrodes 22 and 24 are provided at the upper end portion of the ceramic sheet 21 of the filter body 35. This is a method including a step of providing the mark 27 or the mark 29 on the upper surface of the ceramic sheet 21 of the upper surface filter main body 35 by printing, in addition to providing the same for printing.

The operation of the method of manufacturing the laminated filter having the above structure will be described below. Ceramic sheet 2
1 has the step of providing the mark 27 or the mark 29 on the upper surface thereof, the effect in the first embodiment can be obtained, and at the same time when the mark 27 or the mark 29 is provided, the input / output coupling electrode 17 and the ground electrode are provided. Two
Since there is a step of providing the sneak-in input / output electrode 25 and the sneak-in ground electrode 26 which are also a part of 2, 24, it is possible to simplify the manufacturing process.

As described above, in the third embodiment, when the mark 27 or the mark 29 is provided on the upper surface of the ceramic sheet 21 and when the mark 27 or the mark 29 is provided,
At the same time, since there is a step of providing the sneak-in input / output electrode 25 and the sneak-in earth electrode 26 which are also a part of the input / output electrode 17 and the earth electrodes 22, 24, the effect in the first embodiment can be obtained and the manufacturing process can be performed. Can be simplified.

In this embodiment, the ceramic sheet 2 is used.
The manufacturing method in which the mark 27 or the mark 29 is provided on the upper surface of No. 1 has been described.
By providing, the effect of the second embodiment can be obtained.

[0024]

As described above, according to the present invention, since the mark is provided on the upper surface of the filter body, the directivity of the laminated filter can be easily discriminated and the frequency band can be finely adjusted. In this case, the upper surface of the ceramic sheet corresponding to the strip line can be precisely cut. As a result, it is possible to provide a laminated filter that does not cause poor adjustment, prevents yield reduction, and improves work efficiency.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a laminated filter according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the laminated filter.

FIG. 3 is a top view of the multilayer filter.

FIG. 4 is a top view of a laminated filter according to a second embodiment of the present invention.

FIG. 5 is a perspective view of the laminated filter.

FIG. 6 is an exploded perspective view of a conventional laminated filter.

[Description of Reference Signs] 11 ceramic sheet 12 lower shield electrode 13 ceramic sheet 14 stripline 15 ceramic sheet 16 inter-stage coupling electrode 17 input / output coupling electrode 18 frequency adjusting electrode 19 ceramic sheet 20 upper shield electrode 21 ceramic sheet 22 Ground electrode 23 Input / output electrode 24 Ground electrode 25 Wrap around input / output electrode 26 Wrap around ground electrode 27 Mark 28 Mark 29 Mark 30 Mark 35 Filter body

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Makoto Fujikawa, Makoto Fujiwara, Tanabe-cho, Kyoto Prefecture, Oshima 55-12, Ozumi, Matsushita Nitto Electric Co., Ltd. Sumikojihama 55-12 Matsushita Nitto Electric Co., Ltd.

Claims (5)

[Claims] 1. A filter body formed by laminating a plurality of dielectrics, a strip line and an internal electrode provided between the laminated dielectrics of the filter body, and an electrical connection between the strip line and the internal electrode. And an external electrode provided on the outer peripheral surface of the filter body, the mark being provided on the upper surface of the filter body. 2. A mark provided on the upper surface of the filter body,
The laminated filter according to claim 1, wherein the laminated filter is provided at a position corresponding to the strip line. 3. A first step of forming a filter body by laminating a plurality of dielectrics and a dielectric provided with a stripline and an internal electrode on at least one of the dielectrics, the stripline and the interior. A second step of providing an outer peripheral electrode electrically connecting to an electrode on the outer peripheral surface of the filter body, wherein the first step includes a step of providing a mark on a dielectric on an upper surface of the filter body. Manufacturing method. 4. The method for manufacturing a laminated filter according to claim 3, further comprising the step of providing a mark at a position corresponding to the strip line. 5. The method for manufacturing a laminated filter according to claim 3, further comprising the step of providing a part of the outer peripheral electrode in the first step.