CN2781647Y - Piezoelectric ceramic high frequency wave trap vibrator - Google Patents
Piezoelectric ceramic high frequency wave trap vibrator Download PDFInfo
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- CN2781647Y CN2781647Y CN 200520039214 CN200520039214U CN2781647Y CN 2781647 Y CN2781647 Y CN 2781647Y CN 200520039214 CN200520039214 CN 200520039214 CN 200520039214 U CN200520039214 U CN 200520039214U CN 2781647 Y CN2781647 Y CN 2781647Y
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- piezoelectric ceramic
- high frequency
- vibrator
- frequency wave
- oscillator
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Abstract
The utility model relates to a piezoelectric ceramic high frequency wave trap vibrator, which is a third harmonic piezoelectric ceramic vibrator with thickness telescopic vibration. The piezoelectric ceramic high frequency wave trap vibrator comprises a piezoelectric ceramic sheet (1), wherein one side of the piezoelectric ceramic sheet is provided with two positive electrodes (2) which are not connected and are mutually symmetrically arranged on the piezoelectric ceramic sheet (1); each of the positive electrodes (2) is connected with an extraction electrode (4) of one end respectively; the other side of the piezoelectric ceramic sheet (1) is provided with two negative electrodes (3) corresponding to the two positive electrodes (2) respectively; the two positive electrodes (2) are connected by a connecting band (5). Due to the adaptation of the third harmonic of piezoelectric ceramic with thickness telescopic vibration, the frequency of the piezoelectric ceramic high frequency wave trap vibrator can reach 30 MHz, and the highest frequency of the piezoelectric ceramic high frequency wave trap vibrator can reach 60 MHz; the trap depth of the piezoelectric ceramic high frequency wave trap vibrator can reach 30 dB, and the trap width (10 dB bandwidth) of the piezoelectric ceramic high frequency wave trap vibrator can reach more than 200KHz. The utility model can satisfy the operation requirements of high frequency wave traps completely.
Description
Technical field
The utility model relates to a kind of piezoelectric ceramic high frequency trapper oscillator that utilizes thickness extension vibration to make.
Background technology
Cooperate, be used for adjusting the trapper of vision carrier frequency or sound carrier frequency in the television set with Surface Acoustic Wave Filter, frequency is greater than 30MHz.Because frequency is higher, all adopt surface acoustic wave or BGS ripple to make at present, the technical difficulty of making is bigger, and cost is also higher.Make this class trapper as desire with the thickness extension vibration mode or the thickness shear diaphragm of piezoelectric ceramic, because the frequency constant of these two kinds of patterns is smaller, the about 2240Hzmm of thickness extension vibration mode Nt, thickness shear diaphragm N
15About 1200Hzmm, therefore, the substrate thickness of thickness extension vibration mode needs less than 80 μ m, and the substrate thickness of thickness shear diaphragm needs less than 40 μ m, and this is that present technology is difficult to accomplish.
Summary of the invention
The utility model is intended to propose a kind of structure of utilizing the piezoelectric ceramic high frequency trapper oscillator of piezoelectric ceramic thickness extension vibration making.
This piezoelectric ceramic high frequency trapper oscillator is a thickness extension vibration triple-frequency harmonics piezoelectric ceramic vibrator, comprise a piezoelectric ceramic piece, two mutual disjunct front electrodes are arranged on the face of piezoelectric ceramic piece, divide symmetrically mutually and be on the piezoelectric ceramic piece, each front electrode links to each other with the extraction electrode of an end separately, two reverse side electrodes are arranged on another face of piezoelectric ceramic piece, relative with two front electrodes respectively, be electrically connected by connecting band between two reverse side electrodes.
This piezoelectric ceramic high frequency trapper oscillator makes its making high frequency trapper of application become possibility owing to utilized the triple-frequency harmonics of piezoelectric ceramic thickness extension vibration.The frequency constant Nt of the triple-frequency harmonics of piezoelectric ceramic thickness extension vibration
3Can reach 8000Hzmm, can reach 30MHz, can reach 60MHz with the frequency of its piezoelectric ceramic high frequency trapper oscillator of making.Adopt the piezoelectric ceramic high frequency trapper oscillator of said structure, notch depth can reach 30dB, notch-width (10dB bandwidth) can reach more than the 200KHz, can satisfy the instructions for use of high frequency trapper fully, and the thickness of substrate is 130-270 μ m, uses conventional piezoelectric ceramic process to make.
Description of drawings
Accompanying drawing 1 is a kind of structure chart of piezoelectric ceramic high frequency trapper oscillator;
Accompanying drawing 2 is second kind of structure chart of piezoelectric ceramic high frequency trapper oscillator;
Accompanying drawing 3 is the third structure chart of piezoelectric ceramic high frequency trapper oscillator;
Accompanying drawing 4 is the impedance characteristic of piezoelectric ceramic high frequency trapper oscillator.
Embodiment
As shown in Figure 1, this piezoelectric ceramic high frequency trapper oscillator is a thickness extension vibration triple-frequency harmonics piezoelectric ceramic vibrator, comprise a thickness extension vibration piezoelectric ceramic piece 1, two mutual disjunct front electrodes 2 are arranged on the face of piezoelectric ceramic piece, divide symmetrically mutually and be on the piezoelectric ceramic piece, each front electrode links to each other with the extraction electrode 4 of an end separately, two reverse side electrodes 3 are arranged on another face of piezoelectric ceramic piece 1, relative with two front electrodes respectively, be electrically connected by connecting band 5 between two reverse side electrodes.
The front electrode 2 of the piezoelectric ceramic high frequency trapper oscillator shown in Fig. 1 is circular, and reverse side electrode 3 also is circular.As shown in Figure 2, the front electrode 2 of this piezoelectric ceramic high frequency trapper oscillator also can be for square, and correspondingly, reverse side electrode 3 also is square.
As shown in Figure 3, the extraction electrode 4 that the front electrode 3 of this piezoelectric ceramic high frequency trapper oscillator can also end same with it is connected as a single entity, and becomes 6, two reverse side electrodes of a rectangle 3 and also is connected as a single entity with connecting band 5, becomes a rectangle 7.
The processing method of this piezoelectric ceramic high frequency trapper oscillator is: choose the piezoelectric of the suitable excited thickness stretching vibration triple-frequency harmonics of energy, as lead titanates PbTi
3, lead meta-columbute PbNb
2O
6Deng material, make ceramics according to a conventional method, after being ground to the thickness of characteristic frequency requirement, conducting metal on the evaporation of ceramics two sides, applying a direct current high pressure in the oil bath of heating polarizes to it, the anticorrosive printing ink of printing on ceramics is produced satisfactory electrode pattern then, cuts into oscillator more on request.
This piezoelectric ceramic high frequency trapper oscillator is drawn with terminal pin welding, and paraffin forms cavity on the site, vibration section, wraps epoxy resin cure then, and varnish coating again marks outside, promptly becomes the high frequency trapper.Its impedance characteristic test result as shown in Figure 4, notch depth can reach 30dB, notch-width (10dB bandwidth) can reach more than the 200KHz.
Claims (4)
1, a kind of piezoelectric ceramic high frequency trapper oscillator, it is characterized in that it is a thickness extension vibration triple-frequency harmonics piezoelectric ceramic vibrator, comprise piezoelectric ceramic piece (1), on the face of piezoelectric ceramic piece two mutual disjunct front electrodes (2) are arranged, divide symmetrically mutually and be on the piezoelectric ceramic piece, each front electrode links to each other with the extraction electrode (4) of an end separately, two reverse side electrodes (3) are arranged on another face of piezoelectric ceramic piece, relative with two front electrodes respectively, be electrically connected by connecting band (5) between two reverse side electrodes.
2, piezoelectric ceramic high frequency trapper oscillator as claimed in claim 1 is characterized in that described front electrode (2) for circular, and described reverse side electrode (3) also is circular.
3, piezoelectric ceramic high frequency trapper oscillator as claimed in claim 1 is characterized in that described front electrode (2) for square, and described reverse side electrode (3) also is square.
4, piezoelectric ceramic high frequency trapper oscillator as claimed in claim 3, the extraction electrode (4) that it is characterized in that described front electrode (3) end same with it is connected as a single entity, become a rectangle (6), described two reverse side electrodes (3) also are connected as a single entity with connecting band (5), become a rectangle (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520039214 CN2781647Y (en) | 2005-01-22 | 2005-01-22 | Piezoelectric ceramic high frequency wave trap vibrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520039214 CN2781647Y (en) | 2005-01-22 | 2005-01-22 | Piezoelectric ceramic high frequency wave trap vibrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2781647Y true CN2781647Y (en) | 2006-05-17 |
Family
ID=36762845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520039214 Expired - Lifetime CN2781647Y (en) | 2005-01-22 | 2005-01-22 | Piezoelectric ceramic high frequency wave trap vibrator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2781647Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111224638A (en) * | 2019-11-27 | 2020-06-02 | 湖南嘉业达电子有限公司 | Piezoelectric ceramic frequency discriminator |
-
2005
- 2005-01-22 CN CN 200520039214 patent/CN2781647Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111224638A (en) * | 2019-11-27 | 2020-06-02 | 湖南嘉业达电子有限公司 | Piezoelectric ceramic frequency discriminator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20150122 Granted publication date: 20060517 |