KR920000460Y1 - Piezo-electric monolithic filter - Google Patents
Piezo-electric monolithic filter Download PDFInfo
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- KR920000460Y1 KR920000460Y1 KR2019910018456U KR910018456U KR920000460Y1 KR 920000460 Y1 KR920000460 Y1 KR 920000460Y1 KR 2019910018456 U KR2019910018456 U KR 2019910018456U KR 910018456 U KR910018456 U KR 910018456U KR 920000460 Y1 KR920000460 Y1 KR 920000460Y1
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- piezoelectric
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- monolithic filter
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- 230000001629 suppression Effects 0.000 claims description 17
- 238000005476 soldering Methods 0.000 claims description 5
- 239000006071 cream Substances 0.000 claims description 4
- 230000000644 propagated effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 9
- 230000000903 blocking effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 231100000989 no adverse effect Toxicity 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
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- 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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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
내용 없음.No content.
Description
제1도는 종래의 압전 모놀리딕필터의 구조도로서, (a)도는 상부 구조도 (b)도는 하부 구조도.1 is a structural diagram of a conventional piezoelectric monolithic filter, (a) is a top structure diagram (b) is a lower structure diagram.
제2도는 본 고안의 압전 모놀리딕필터의 구조도로서, (a)도는 상부 구조도, (b)도는 하부 구조도, (c)도는 (a)도의 A-A선 단면도.2 is a structural diagram of the piezoelectric monolithic filter of the present invention, (a) is a top structure diagram, (b) is a bottom structure diagram, (c) is a cross-sectional view taken along the line A-A.
제3도는 본 고안에 채용된 진동억제용 전극의 원리를 나타낸 설명도로서, (a)도는 압전성 진동의 전파가 발생하는 상태도, (b)도는 진동억제용 전극에서의 입사파의 반사를 나타낸 상태도.3 is an explanatory diagram showing the principle of the vibration suppression electrode employed in the present invention, (a) is a state diagram of the propagation of piezoelectric vibration, (b) is a reflection of the incident wave in the vibration suppression electrode State diagram.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for the main parts of the drawings
4 : 압전기판 2, 2-1, 3, 3-1 : 필터부 전극4: piezoelectric plates 2, 2-1, 3, 3-1: filter part electrode
4, 4-1 : 진동억제용 전극 5 : 전극 연결부4, 4-1: vibration suppression electrode 5: electrode connection
6 : 연결전극 7 : 압력단자6 connection electrode 7 pressure terminal
8 : 출력단자 9 : 접지단자8: Output terminal 9: Ground terminal
본 고안은 1개의 압전기판상에 에너지 트랩(Energy Traq)형 두께 종진동 또는 두께 비틀림진동모드를 이용하여 2개 이상의 압전필터를 설치한 압전 모놀리딕필터 (Monolithic Filter)에 관한 것으로, 압전기 판상의 각 필터부 사이에 압전성 진동 억제용 전극을 설치하여 압전필터의 스퓨리어스(Spurious)를 제거하도록 함으로써 스퓨리어스 진동이 각 필터부 사이에서 전파되는 것을 방지한 것이다.The present invention relates to a piezoelectric monolithic filter in which two or more piezoelectric filters are installed using an energy trap type thick longitudinal vibration or a thickness torsional vibration mode on one piezoelectric plate. A piezoelectric vibration suppression electrode is provided between the filter portions to remove spurious of the piezoelectric filter, thereby preventing the spurious vibrations from propagating between the filter portions.
종래에는 첨부도면 제1도에 예시된 바와같이 일본의 무라다(MURATA)세이사뀨쇼가 1972년 미국특허 제3,763,446호에서 압전 모놀리딕필터의 스퓨리어스 특성을 개선하기 위하여 압전기판(11)상의 각 필터부(12)(12-1)(3)(3-1)사이에 차단홈 (14)을 형성하여 압전성 진동이 각 필터부 사이에서 전파되는 것을 방지하도록 하였던 것이다.Conventionally, as illustrated in FIG. 1 of the accompanying drawings, MURATA Seisakusho of Japan discloses each filter on the piezoelectric plate 11 to improve the spurious characteristics of the piezoelectric monolithic filter in US Patent No. 3,763,446 in 1972. The blocking grooves 14 were formed between the parts 12, 12-1, 3, and 3-1 to prevent the piezoelectric vibration from propagating between the filter parts.
그러나, 상기와 같이 각 필터부 사이에 차단홈을 형성하는 것을 홈을 만들기 위한 제조공정상의 복잡성과 홈이 형성에 따른 소체 파손의 우려등과 함께 원가상승의 요인이 되어 원가절감면에서 많은 어려움이 뒤따르게 되었던 것이다.However, the formation of the blocking grooves between the filter units as described above is a factor in the cost increase due to the complexity of the manufacturing process for making the grooves and the risk of body breakage due to the formation of the grooves. It was followed.
본 고안은 상술한 바와같이 압전소체에 차단홈을 형성하는 종래의 기술에서 나타난 결점들을 해결하여 제조가 간단하고 원가절감을 할수 있으며, 압전 모놀리딕필터의 스퓨리어스 특성을 개선할 수 있도록 함에 고안의 목적이 있는 것이다.The present invention solves the drawbacks of the prior art of forming a blocking groove in the piezoelectric body as described above, the production is simple and can reduce the cost, and the purpose of the invention to improve the spurious characteristics of the piezoelectric monolithic filter Is there.
본 고안의 내용을 첨부도면 제2도에 의하여 상세히 설명하면 다음과 같다.Referring to the contents of the present invention in detail with reference to the accompanying drawings 2 as follows.
즉, 1개의 압전기판상에 에너지트램형 두께 종진동 또는 두께 비틀림진동모드를 이용하여 2개이상의 압전필터를 설치한 압전 모놀리딕필터에 있어서, 압전기판(1)상의 상부와 하부에 각각 형성된 각 필터부전극(2)(2-1)(3)(3-1)사이에 진동억제용 전극(4)(4-1)을 형성하고, 이들 상, 하부의 진동억제용 전극(4)(4-1)을 납땜, 솔더크림(Solder Cream) 또는 그밖의 방법에 의해 전기적으로 상호연결한 연결부(5)를 형성함으로써 압전성 진동이 각 필터부 사이에서 전파되지 않도록 함을 특징으로 하는 압전 모놀리딕필터이다.That is, in a piezoelectric monolithic filter in which two or more piezoelectric filters are provided by using an energy tram type thick longitudinal vibration or a thickness torsional vibration mode on one piezoelectric plate, each filter formed on the upper and lower portions of the piezoelectric plate 1, respectively. Vibration suppression electrodes 4 and 4-1 are formed between the sub-electrodes 2, 2-1, 3 and 3-1, and the vibration suppression electrodes 4 and 4 above and below them. Piezoelectric monolithic filter, characterized in that piezoelectric vibrations do not propagate between each filter part by forming a connection part 5 electrically interconnected by soldering, solder cream or the like. to be.
본 고안에서는 첨부도면 제1도에 도시된 동래의 압전기판상의 각 필터부 사이에 형성되었던 차단홈의위치에 진동억제용 전극(4)(4-1)을 형성하고, 이 진동억제용 전극(4)(4-1)을 납땜, 솔더크림등의 수단으로 형성되는 연결부(5)에 의해 전기적으로 상호연결시켜 주므로서 압전성에 기인한 어떠한 진동현상도 진동억제용 전극을 전파해 갈수 없도록 한 것이다.In the present invention, vibration suppression electrodes 4 and 4-1 are formed at positions of blocking grooves formed between respective filter parts on the same piezoelectric plate shown in FIG. 1, and the vibration suppression electrode ( 4) (4-1) is electrically interconnected by the connecting portion 5 formed by soldering, soldering cream, etc., so that any vibration phenomenon due to piezoelectricity cannot propagate the vibration suppressing electrode. .
상기 진동억제용전극의 형성은 각 필터부의 전극형성과 동일공정에서 한꺼번에 이루어지게 되므로서 제조공정상에서 원가상승 요인이 없게 된다.The vibration suppression electrode is formed in the same process as the electrode formation of each filter unit, so that there is no cost increase factor in the manufacturing process.
또한, 진동억제용 전극(4)(4-1)은 각 필터부전극(2)(2-1)(3)(3-1)과 연결전극(6) 및 입, 출력단자7)(8), 접지단자(9)등과 전기적인 연결이 이루어지지 않고, 간격을 두고 있으므로서 스퓨리어스 제거 이외의 필터특성에는 전혀 나쁜 영향을 주지않는 것이다.In addition, the vibration suppressing electrodes 4 and 4-1 are each filter part electrodes 2, 2-1, 3, 3-1, the connecting electrode 6, and the input and output terminals 7 and 8, respectively. ), There is no electrical connection with the ground terminal 9, etc., and there is no adverse effect on the filter characteristics other than spurious removal at intervals.
본 고안의 진동억제용 전극이 압전성에 기인한 모든 진동을 차단할 수 있는 원리를 첨부도면 제3도에 의하여 설명하면 다음과 같다.When the vibration suppression electrode of the present invention to block all the vibration caused by the piezoelectricity will be described with reference to Figure 3 as follows.
압전성에 의하여 진동이 전파될때는 (a)도에 도시된 바와같이 압전소체의 표면에 미소 전하를 발생시키면서 즉, 압전소체의 표면에 미소 전위차를 발생시키면서 진동이 전파하여 간다.When the vibration propagates due to piezoelectricity, as shown in (a), the vibration propagates while generating a small charge on the surface of the piezoelectric body, that is, generating a small potential difference on the surface of the piezoelectric body.
그러나, (b)도에 도시된 바와같이 압전소체의 상ㆍ하부에 진동억제용 전극을 설치하고, 이들 전극을 전기적으로 연결하여 이들 전극 사이의 전위차를 제거하면 압전체의진동에 의하여 미소 전하가 발생되는 것이 방지된다.However, as shown in (b), when a vibration suppression electrode is provided on the upper and lower parts of the piezoelectric body, and these electrodes are electrically connected to remove the potential difference between these electrodes, micro charges are generated by vibration of the piezoelectric body. Is prevented.
즉, 압전체의 진동에 대하여 상하 전극의 전위차가 없다는 전기적인 경게조건에 의하여, 이들 진동억제용 전극에로의 입사파는 반사되어 버린다.That is, the incident waves to these vibration suppression electrodes are reflected by the electrical warning condition that there is no potential difference between the upper and lower electrodes with respect to the vibration of the piezoelectric body.
이와 유사한 예로는 금속표면이 빛을 반사하는 이유와 같다. 즉, 금속은 전기적인 도체이고 입사되는 빛인 전자기파는 금속이 도체임으로 인하여 반사되어 버린다.A similar example is the reason why the metal surface reflects light. That is, the metal is an electrical conductor and the electromagnetic wave, which is incident light, is reflected because the metal is a conductor.
물론, 이때의 금속은 입사되는 빛의 파장에 대해 일정두께 이상을 가져야 한다.Of course, the metal at this time should have a certain thickness or more with respect to the wavelength of the incident light.
본 고안의 진동억제용 전극에 의한 스퓨리어스 제거방법에 대해 설명하면 다음과 같다.The spurious removal method by the vibration suppression electrode of the present invention is described as follows.
필터의 통과 대역의 주파수는 제2도의 1차 필터부에서 에너지 트랩현상이 일어나서 연결전극에 의하여 2차 필터부로 전기 신호가 전달되지만, 통과 대역 이외의 주파수의 진동 즉, 스퓨리어스 신호는 에너지 트램이 일어나지 않는 주파수의 진동으로서, 1차 필터부에서 발생한 이들 스퓨리어스 진동은 연결 전극에 의하지 않고 바로 2차 필터부로 그 진동이 전파되어 필터 특성의 스퓨리어스를 발생시킨다.The frequency of the pass band of the filter is an energy trap phenomenon in the primary filter part of FIG. 2 and the electrical signal is transmitted to the secondary filter part by the connecting electrode, but the vibration of the frequency other than the pass band, that is, the spurious signal does not generate an energy tram. As the vibration of the non-frequency, these spurious vibrations generated in the primary filter portion propagate the vibration directly to the secondary filter portion without being connected to the connecting electrode, thereby generating a spurious filter characteristic.
이때, 본 고안의 진동 억제용 전극이 설치되어 있으면 1차 필터부에서 2차 필터부로의 스퓨리어스 진동의 전파를 차단할 수 있게 된다.At this time, if the vibration suppressing electrode of the present invention is provided, it is possible to block the propagation of the spurious vibration from the primary filter portion to the secondary filter portion.
이상과 같이 본 고안에 의하면, 압전소체에 홈을 파지 않고도 필터 전극의 형성시 본 고안의 진동억제용 전극을 동일공정에서 한꺼번에 형성하고, 이들 진동억제용 두 전극을 납땜, 솔더크림등의 방법으로 간단히 전기저으로 연결시켜 압전 모놀리딕 필터에서 각 필터부 사이에서의 스퓨리어스 진동의 전파를 차단하여 필터의 스퓨리어스 특성을 개선하고 제조원가를 절감할 수 있는 것이다.As described above, according to the present invention, when forming the filter electrode without digging a piezoelectric body, the vibration suppression electrode of the present invention is formed at the same time in the same process, and these vibration suppression electrodes are soldered, solder cream or the like. By simply connecting with an electric bottom, the spurious vibration between each filter part in the piezoelectric monolithic filter can be blocked to improve the spurious characteristics of the filter and reduce the manufacturing cost.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019910018456U KR920000460Y1 (en) | 1989-06-19 | 1991-11-01 | Piezo-electric monolithic filter |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019890008434A KR910002111A (en) | 1989-06-19 | 1989-06-19 | Piezoelectric Monolithic Filter |
| KR2019910018456U KR920000460Y1 (en) | 1989-06-19 | 1991-11-01 | Piezo-electric monolithic filter |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019890008434A Division KR910002111A (en) | 1989-06-19 | 1989-06-19 | Piezoelectric Monolithic Filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR920000460Y1 true KR920000460Y1 (en) | 1992-01-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019910018456U KR920000460Y1 (en) | 1989-06-19 | 1991-11-01 | Piezo-electric monolithic filter |
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| Country | Link |
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| KR (1) | KR920000460Y1 (en) |
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1991
- 1991-11-01 KR KR2019910018456U patent/KR920000460Y1/en not_active IP Right Cessation
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