KR940005934Y1 - Monolithic filter - Google Patents
Monolithic filter Download PDFInfo
- Publication number
- KR940005934Y1 KR940005934Y1 KR2019880019543U KR880019543U KR940005934Y1 KR 940005934 Y1 KR940005934 Y1 KR 940005934Y1 KR 2019880019543 U KR2019880019543 U KR 2019880019543U KR 880019543 U KR880019543 U KR 880019543U KR 940005934 Y1 KR940005934 Y1 KR 940005934Y1
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- South Korea
- Prior art keywords
- electrode
- spurious
- filter
- monolithic filter
- width
- Prior art date
Links
- 238000000034 method Methods 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 description 7
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- H03H3/02—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
내용 없음.No content.
Description
제1도는 종래의 모놀리딕 필터의 전극구조도.1 is an electrode structure diagram of a conventional monolithic filter.
제1a도는 필터 전면의 전극구조도.Figure 1a is an electrode structure of the front filter.
제1b도는 필터 후면의 전극구조도.Figure 1b is an electrode structure of the back of the filter.
제2도는 종래의 모놀리딕 필터를 수지로 봉합한 상태의 단면도.2 is a cross-sectional view of a conventional monolithic filter sealed with a resin.
제3도는 본 고안의 모놀리딕 필터의 전극구조도.3 is an electrode structure diagram of a monolithic filter of the present invention.
제3a도는 필터 전면의 전극구조도.Figure 3a is an electrode structure of the front filter.
제3b도는 필터 후면의 전극구조도.Figure 3b is the electrode structure of the filter back.
제4도는 본 고안의 모놀리딕 필터를 수지로 봉합한 상태의 단면도.4 is a cross-sectional view of a state in which the monolithic filter of the present invention is sealed with a resin.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 필터본체 2 : 압전기판1: filter body 2: piezoelectric plate
3,3-1 : 압전필터 4 : 스퓨리어스(Spurious)제거용 전극3,3-1: Piezoelectric filter 4: Spurious removal electrode
5 : 진동부 전극 6 : 리더(Leader)부 전극5: Vibration part electrode 6: Leader part electrode
a : 스퓨리어스제거용 차단홈 W : 스퓨리어스제거용 전극의 폭a: Blocking groove for spurious removal W: Width of electrode for spurious removal
W' : 진동부전극의 폭W ': width of the vibrating electrode
본 고안은 에너지트랩(Energy Trap)형 두께 종진동 또는 두께 비틀림진동, 두께 미끄럼진동모드(Mode)를 이용하여 2개이상의 압전필터(Piezo-electric Filter)를 하나의 압전기판상에 착설한 모놀리딕 필터(Monolithic Filter)에 관한 것으로, 2개의 압전필터 사이에 스퓨리어스(Spurious)제거용 전극을 형성하여서 되는 것이다.The present invention is a monolithic filter in which two or more piezo-electric filters are installed on one piezoelectric plate using energy trap type thickness longitudinal vibration, thickness torsional vibration, and thickness sliding vibration mode. (Monolithic Filter), which is formed by forming an electrode for spurious removal between two piezoelectric filters.
종래의 모놀리딕 필터는 불필요한 스퓨리어스를 제거하기 위하여 첨부도면 제1도 및 제2도에 도시된 바와 같이 모놀리딕 필터(1)를 구성할때, 하나의 압전기판상(2)에 착설되는 2개의 압전필터(3)(3-1)사이에 스퓨리어스 제거용 차단용홈(a)을 형성하므로서, 불필요한 스퓨리어스의 전파를 차단, 제거하였던 것이다.The conventional monolithic filter has two piezoelectric elements installed on one piezoelectric plate 2 when constituting the monolithic filter 1 as shown in FIGS. 1 and 2 of the accompanying drawings to remove unnecessary spurious. The spurious removal blocking groove a was formed between the filters 3 and 3-1 to block and remove unnecessary spurious propagation.
그러나, 이렇게 스퓨리어스 제거용 차단홈(a)을 형성하기 위하여는 제조공정에서 홈을 만들기 위한 복잡한 공정이 추가되어야 하고, 홈파기 작업도 복잡하여, 그에 따른 기판의 파손등이 증가되므로서 필터의 생산 원가의 상승요인이 발생하는 등의 결점이 있었던 것이다.However, in order to form the spurious removal blocking groove (a), a complicated process for making grooves must be added in the manufacturing process, and the groove digging work is complicated, resulting in increase of breakage of the substrate, thereby producing a filter. There was a flaw, such as a cost increase factor.
본 고안은 상기와 같은 종래의 결점을 해결보완하기 위하여 스퓨리어스 제거용 차단홈을 형성하는 대신에 차단홈의 위치에 스퓨리어스 제거용 전극을 형성하므로서, 추가공정이 필요 없을 뿐만 아니라, 스퓨리어스를 효율적으로 제거할수 있는 모놀리딕 필터를 제공하고져 함에 고안의 목적이 있는 것이다.The present invention forms a spurious removal electrode at the location of the blocking groove instead of forming the spurious removal blocking groove in order to solve the above-mentioned drawbacks as described above, thereby eliminating the need for an additional process and efficiently removing the spurious. The purpose of the invention is to provide a monolithic filter that can be used.
본 고안의 내용을 첨부도면 제3도 및 제4도에 의하여 상세히 설명하면 다음과 같다.The contents of the present invention will be described in detail with reference to FIGS. 3 and 4 as follows.
즉, 하나의 압전기판(2)상에 2개이상의 압전필터(3)(3-1)를 착설하는 모놀리딕 필터(1)를 구성함에 있어서, 2개의 압전필터(3)(3-1)사이에 진동부전극(5) 및 리더(Leader)부 전극(6)과 전기적 연결이 없도록 스퓨리어스 제거용 전극(4)을 일정한 폭(W)으로 형성하되, 스퓨리어스 제거용 전극(4)의 폭(W)을 진동부 전극(5)의 폭(W')보다 작게 형성함을 특징으로하는 모놀리딕 필터이다. 미설명부호 7은 수지, 8은 공동(Cavity)이다.That is, in forming the monolithic filter 1 which installs two or more piezoelectric filters 3 and 3-1 on one piezoelectric plate 2, the two piezoelectric filters 3 and 3-1 are constructed. The spurious removal electrode 4 is formed to have a constant width W so that there is no electrical connection between the vibrating portion electrode 5 and the leader portion electrode 6 therebetween, but the width of the spurious removing electrode 4 W) is a monolithic filter characterized by forming smaller than the width (W ') of the vibrating portion electrode (5). Reference numeral 7 is a resin, and 8 is a cavity.
이러한 본 고안의 모놀리딕 필터는 종래와 같이 2개의 압전필터 사이에 스퓨리어스 제거용 차단홈을 형성하는 대신에, 진동부 전극(5) 및 리더부 전극(6)을 형성함과 동시에 2개의 압전필터(3)(3-1)사이에 스퓨리어스 제거용 전극(4)을 일정한 폭(W)으로 형성하므로서, 종래에 스퓨리어스 제거용 차단홈의 형성을 위한 별도의 추가공정이 불필요하여 작업공정이 간단하고, 기판(2)의 파손이나 불량도 감소되는 효과를 제공받을 수 있는 것이다.The monolithic filter of the present invention has two piezoelectric filters at the same time as forming the vibrating part electrode 5 and the leader part electrode 6 instead of forming a spurious removal blocking groove between the two piezoelectric filters as in the prior art. (3) The spurious removal electrode 4 is formed to have a constant width (W) between (3-1), so that an additional step for forming a spurious removal blocking groove is unnecessary in the past and the work process is simple. In addition, damage or failure of the substrate 2 can be provided with the effect of being reduced.
본 고안은 스퓨리어스를 제거하기 위하여 에너지트랩 현상을 역이용하므로서, 원하는 주파수 밴드(Band)내의 주파수는 기존 전극부를 따라서 전기적으로 전달되지만, 원하는 주파수 밴드 보다 높은 주파수는 2개의 압전필터 사이에 형성된 스퓨리어스 제거용 전극에 의해 트랩되도록 한 것이다.The present invention uses the energy trap phenomenon to remove spurious, so that the frequency in the desired frequency band (Band) is electrically transmitted along the existing electrode, but the frequency higher than the desired frequency band for spurious removal formed between two piezoelectric filters. To be trapped by an electrode.
따라서, 스퓨리어스진동은 2개의 압전필터 사이에 형성된 스퓨리어스 제거용 전극에 집중되고, 기존 필터의 진동부는 공동(Cavity)으로 형성되어 진동이 자유롭게 되는 것이다.Therefore, the spurious vibration is concentrated on the spurious removal electrode formed between the two piezoelectric filters, and the vibration part of the existing filter is formed as a cavity so that the vibration is free.
이렇게 스퓨리어스 제거용 전극에 집중된 스퓨리어스에 해당하는 주파수의 기계적 진동은 압전기판을 봉합하고 있는 수지에 의해 스퓨리어스 진동이 흡수되어서 필터의 스퓨리어스 특성이 개선되게 되는 것이다.The mechanical vibration of the frequency corresponding to the spurious concentrated on the spurious removal electrode is such that the spurious vibration is absorbed by the resin sealing the piezoelectric plate, thereby improving the spurious characteristics of the filter.
본 고안은 스퓨리어스 제거용 전극의 폭(W)을 진동부 전극의 폭(W')보다 작게 즉, W ＞ W'로 형성하므로서 원하는 주파수밴드보다 높은 주파수의 스퓨리어스를 제거할 수 있는 것이며, 스퓨리어스 제거용 전극의 폭을 진동부 전극의 폭보다 작게 하면서 그 폭의 크기를 임의로 조절함에 따라 특정 주파수 밴드에 해당하는 스퓨리어스를 집중적으로 제거할 수 있는 매우 실용적이며, 유용한 고안인 것이다.The present invention is capable of removing spurious at frequencies higher than a desired frequency band by forming the width W of the spurious removing electrode smaller than the width W 'of the vibrating electrode, that is, W> W'. As the width of the dragon electrode is smaller than the width of the vibrating part electrode, the width is arbitrarily adjusted, so that the spurious corresponding to a specific frequency band can be removed intensively and is a useful design.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019880019543U KR940005934Y1 (en) | 1988-11-30 | 1988-11-30 | Monolithic filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019880019543U KR940005934Y1 (en) | 1988-11-30 | 1988-11-30 | Monolithic filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR900010989U KR900010989U (en) | 1990-06-04 |
| KR940005934Y1 true KR940005934Y1 (en) | 1994-08-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019880019543U KR940005934Y1 (en) | 1988-11-30 | 1988-11-30 | Monolithic filter |
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| Country | Link |
|---|---|
| KR (1) | KR940005934Y1 (en) |
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1988
- 1988-11-30 KR KR2019880019543U patent/KR940005934Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR900010989U (en) | 1990-06-04 |
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