CN202713189U - Double-interdigital electrode piezoelectric micro energy generator - Google Patents
Double-interdigital electrode piezoelectric micro energy generator Download PDFInfo
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- CN202713189U CN202713189U CN 201220426305 CN201220426305U CN202713189U CN 202713189 U CN202713189 U CN 202713189U CN 201220426305 CN201220426305 CN 201220426305 CN 201220426305 U CN201220426305 U CN 201220426305U CN 202713189 U CN202713189 U CN 202713189U
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Abstract
The utility model relates to a double-interdigital electrode piezoelectric micro energy generator. The object of the utility model is to solve the problem of small quantity of outputted electric charge of an existing cantilever type piezoelectric micro energy generator. According to the double-interdigital electrode piezoelectric micro energy generator provided by the utility model, a fixed end of a base plate is fixedly arranged on an installation base, and a free end of the base plate is suspended in the air; two surfaces of the base plate are respectively provided with a piezoelectric sheet; one surface of each piezoelectric sheet completely covers the surfaces of the base plate, and the other surface of each piezoelectric sheet is provided with interdigital electrodes; each interdigital electrode comprises two unilateral electrodes; each of unilateral electrode comprises a plurality of metal digitate bars which are connected through a converging metal bar; the metal digitate bars of two unilateral electrodes at the same piezoelectric sheet are staggerly arranged; the widths of all the metal digitate bars are identical; the gag between two adjacent metal digitate bars of the same interdigital electrode is 1.5 to 5 times of the width of the metal digitate bars; and the gap between projections of two adjacent metal digitate bars on the base plate is identical. Based on characteristics of stress distribution of the cantilever type piezoelectric micro energy generator, the utility model provides the double-interdigital electrode piezoelectric micro energy generator which can assist in increasing the density of output power.
Description
Technical field
The utility model belongs to the piezo technology field, relates to a kind of two interdigital piezoelectric micromotor power generator, specifically a kind of device of the energy being provided for the various Embedded micro-systems such as sensor-based system, actuating system, intelligence system.
Background technology
The piezoelectric micromotor power generator is a kind of by automatically gathering the vibrational energy in the environment, the device of supply circuit system, sensing system energy can be used for the distributed sensor system of the biology sensor of implant into body, the tire pressure monitoring system that places automobile tire inside, factory's motor etc.Utilize the vibrational energy of environment to come little energy source device to system power supply, have the time-independent characteristics of output power density with respect to traditional lithium battery, as: used 1 year, the decline output power density of power generator of piezoelectricity is 250 μ W/ cm
3, the output power density of rechargeable lithium ion batteries is not 45 μ W/ cm
3Used 10 years, the output power density of piezoelectric micromotor power generator still is 250 μ W/ cm
3, the output power density of not chargeable Li ion battery then is 35 μ W/ cm
3Can find out that therefrom the decline output power density of power generator of piezoelectricity is higher than the output power density of lithium ion battery, and can be as lithium ion battery, output power density in time passing and reduce.
At present the piezoelectricity power generator that declines adopts suspension beam structure more, usually based on d33 and two kinds of patterns of d31.Based on the hang oneself from a beam characteristics with high output voltage of little power generator of the piezoelectricity of d33 pattern, but electric charge is low.
Summary of the invention
The purpose of this utility model overcomes the deficiencies in the prior art exactly, and a kind of two interdigital electrode formula piezoelectric micromotor power generators of high-output power density are provided, and is adapted at using in the systems such as biology sensor, tire pressure monitoring, motor detection.
The utility model comprises pedestal, substrate, piezoelectric patches, inserts the finger electrode.
The cross section of described pedestal is L shaped, comprises horizontal base and vertically is arranged on mount pad on the horizontal base.
The stiff end of described substrate is fixedly installed on the mount pad, free end is unsettled; Described substrate is the sheet metal of strip, adopts elastic metallic material; The two sides of substrate is respectively arranged with piezoelectric patches, the complete covered substrate of the one side of piezoelectric patches surface, and another side is provided with to insert and refers to electrode.
Described slotting finger electrode is conductive metal sheet or metal film, covers on the piezoelectric patches; Each is inserted and refers to that electrode comprises two monolateral electrodes, and each monolateral electrode comprises a plurality of parallel metal fingers, and many metal fingers connect by compiling bonding jumper.The metal finger that is positioned at two monolateral electrodes on the same piezoelectric patches is crisscross arranged, and forms to insert to refer to electrode; The width a of all metal fingers equates that the gap b of two adjacent metal fingers of same slotting finger electrode is 1.5～5 times of metal finger width a.Each monolateral electrode is connected with lead-in wire.
Two projections of metal finger on substrate of inserting the finger electrode that are positioned at the substrate both sides are crisscross arranged, and form palisade, and the gap c of adjacent two projections of metal finger on substrate is identical.
The material of described substrate is phosphor bronze, and the material of described piezoelectric patches is doped PZT pottery or ZnO or AlN or PVDF.
During work, the substrate free end moves up and down in the situation of stressed or resonance, piezoelectric patches is crooked, the electric energy that horizontal axis deformation produces takes out (namely utilizing the generating of d33 vibration mode) by the slotting finger electrode with layer, and the electric energy that vertical axial deformation produces is inserted by subtend and referred to that electrode takes out (namely utilizing the generating of d31 vibration mode).The utility model proposes the piezoelectric micromotor power generator of two interdigital electrode forms on the characteristics basis that takes into full account suspension beam type piezoelectric micromotor power generator stress distribution, improved output power density.
Description of drawings
Fig. 1 is cross-sectional view of the present utility model;
Fig. 2 is plan structure schematic diagram of the present utility model.
Embodiment
As illustrated in fig. 1 and 2, two interdigital electrode formula piezoelectric micromotor power generators comprise pedestal, substrate, piezoelectric patches, insert the finger electrode.
The cross section of pedestal is L shaped, comprises horizontal base 1-1 and vertically is arranged on mount pad 1-2 on the horizontal base.
The stiff end of substrate 2 is fixedly installed on the mount pad 1-2, free end is unsettled.Substrate is the sheet metal of strip, adopts elastic metallic material, such as phosphor bronze.The two sides of substrate is respectively arranged with piezoelectric patches 3-1 and 3-2, the complete covered substrate of the one side of piezoelectric patches 2 surfaces, and another side is provided with to insert and refers to that electrode, the material of piezoelectric patches are doped PZT pottery or ZnO or AlN or PVDF.
Inserting the finger electrode is conductive metal sheet or metal film, covers on the piezoelectric patches.The slotting finger electrode (Fig. 2 solid line is drawn) that is arranged in substrate 2 tops comprises two monolateral electrodes, and each monolateral electrode comprises a plurality of parallel metal finger 4-1-1, and many metal finger 4-1-1 connect by compiling bonding jumper 4-1-2.The slotting finger electrode that is arranged in substrate 2 bottoms comprises two monolateral electrodes (Fig. 2 dotted line is drawn) equally, and each monolateral electrode comprises a plurality of parallel metal finger 4-2-1, and many metal finger 4-2-1 connect by compiling bonding jumper 4-2-2.
The metal finger that is positioned at two monolateral electrodes on the same piezoelectric patches is crisscross arranged, and forms to insert to refer to electrode, such as the solid line metal finger among Fig. 2 and dotted line metal finger; The width a of all metal fingers equates that the gap b of two adjacent metal fingers of same slotting finger electrode is 1.5～5 times of metal finger width a.Each monolateral electrode is connected with lead-in wire.
Two projections of metal finger on substrate of inserting the finger electrode that are positioned at the substrate both sides are crisscross arranged, and form palisade, and the gap c of adjacent two projections of metal finger on substrate is identical.
During work, the substrate free end moves up and down the piezoelectric layer Bending Deformation in the situation of stressed or resonance, cause the change of piezoelectric surface bound charge, cause the variation of electric field, promote the movement of free electron, just have at this moment alternating current output in the interdigital electrode layer of piezoelectric layer both sides.The alternating current of output is stored after rectification, filtering and can supply with electronic installation.
Claims (2)
1. a two interdigital electrode formula piezoelectric micromotor power generator comprises pedestal, substrate, piezoelectric patches, inserts the finger electrode, it is characterized in that:
The cross section of described pedestal is L shaped, comprises horizontal base and vertically is arranged on mount pad on the horizontal base;
The stiff end of described substrate is fixedly installed on the mount pad, free end is unsettled; Described substrate is the sheet metal of strip, adopts elastic metallic material; The two sides of substrate is respectively arranged with piezoelectric patches, the complete covered substrate of the one side of piezoelectric patches surface, and another side is provided with to insert and refers to electrode;
Described slotting finger electrode is conductive metal sheet or metal film, covers on the piezoelectric patches; Each is inserted and refers to that electrode comprises two monolateral electrodes, and each monolateral electrode comprises a plurality of parallel metal fingers, and many metal fingers connect by compiling bonding jumper; The metal finger that is positioned at two monolateral electrodes on the same piezoelectric patches is crisscross arranged, and forms to insert to refer to electrode; The width a of all metal fingers equates that the gap b of two adjacent metal fingers of same slotting finger electrode is 1.5～5 times of metal finger width a; Each monolateral electrode is connected with lead-in wire;
Two projections of metal finger on substrate of inserting the finger electrode that are positioned at the substrate both sides are crisscross arranged, and form palisade, and the gap c of adjacent two projections of metal finger on substrate is identical.
2. a kind of pair of interdigital electrode formula piezoelectric micromotor power generator as claimed in claim 1, it is characterized in that: the material of described substrate is phosphor bronze, the material of described piezoelectric patches is doped PZT pottery or ZnO or AlN or PVDF.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220426305 CN202713189U (en) | 2012-08-27 | 2012-08-27 | Double-interdigital electrode piezoelectric micro energy generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220426305 CN202713189U (en) | 2012-08-27 | 2012-08-27 | Double-interdigital electrode piezoelectric micro energy generator |
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| Publication Number | Publication Date |
|---|---|
| CN202713189U true CN202713189U (en) | 2013-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220426305 Withdrawn - After Issue CN202713189U (en) | 2012-08-27 | 2012-08-27 | Double-interdigital electrode piezoelectric micro energy generator |
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| CN (1) | CN202713189U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820806A (en) * | 2012-08-27 | 2012-12-12 | 杭州电子科技大学 | Piezoelectric micro-energy resource generator with double interdigital electrodes |
| CN106685265A (en) * | 2017-01-22 | 2017-05-17 | 合肥红佳科技信息有限公司 | Self-charging mouse based on two-stage vibration |
-
2012
- 2012-08-27 CN CN 201220426305 patent/CN202713189U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820806A (en) * | 2012-08-27 | 2012-12-12 | 杭州电子科技大学 | Piezoelectric micro-energy resource generator with double interdigital electrodes |
| CN102820806B (en) * | 2012-08-27 | 2015-05-20 | 杭州电子科技大学 | Piezoelectric micro-energy resource generator with double interdigital electrodes |
| CN106685265A (en) * | 2017-01-22 | 2017-05-17 | 合肥红佳科技信息有限公司 | Self-charging mouse based on two-stage vibration |
| CN106685265B (en) * | 2017-01-22 | 2018-02-27 | 合肥红佳科技信息有限公司 | A kind of self-charging mouse based on twin-stage vibration |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130130 Effective date of abandoning: 20150520 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20130130 Effective date of abandoning: 20150520 |
|
| RGAV | Abandon patent right to avoid regrant |