CN207456474U - Cantilever piezoelectric film small-signal sensor - Google Patents
Cantilever piezoelectric film small-signal sensor Download PDFInfo
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- CN207456474U CN207456474U CN201721563410.2U CN201721563410U CN207456474U CN 207456474 U CN207456474 U CN 207456474U CN 201721563410 U CN201721563410 U CN 201721563410U CN 207456474 U CN207456474 U CN 207456474U
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- overarm brace
- piezoelectric film
- signal sensor
- lower cover
- contact
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Abstract
The utility model is related to a kind of cantilever piezoelectric film small-signal sensors, including shell, overarm brace, piezoelectric membrane and signal processing circuit, the sealing space that shell is made of upper cover and lower cover, overarm brace is arranged between upper cover and lower cover, overarm brace one end is fixedly connected by a fixed pivot with the lower cover, the other end is vacant state, upper lid is equipped with a contact, the contact is in contact with the free end of overarm brace, for oppressing the free end of overarm brace, piezoelectric membrane is close to one side of the overarm brace towards upper cover.Its advantage is shown as：Closure is formed using bonding between upper and lower covers, half hanging overarm brace and piezoelectric membrane is oppressed by designing a contact on upper lid, piezoelectric membrane is made only to be subject to the vibration pressure of upper cover one side, interference of other the extraneous vibration signals to piezoelectric membrane can be greatly reduced.
Description
Technical field
The utility model is related to jogging sensor structure-design technique fields, are a kind of cantilever piezoelectrics specifically
Film small-signal sensor.
Background technology
Cantilever piezoelectric thin film sensor application principle is：The upper cover of sensor and the relative motion of lower cover, make upper cover
Fulcrum oppress hanging overarm brace one end, be bent downwardly overarm brace formation, due to overarm brace have it is certain hard
Degree, reclinate deformation is uniform, the piezoelectric membrane homogeneous deformation being close on overarm brace is driven, so as to fulfill sensor pair
In the acquisition of physiological parameter.
Existing sensor structure uses the structure of bridge type, i.e. the both ends of overarm brace are each to fix a fulcrum, works as crossbeam
During bracket bent, both sides, which are fixed, only has center section to generate deformation, it is understood that there may be the irregular problem of piezoelectric membrane deformation causes
Distorted signals influences the precision of data acquisition.
Piezoelectric membrane has the characteristics that soft easy deformation, and the interference of extraneous vibration is easily received during use, and shows
Have in technology and do not related to for how to avoid or reduce the solution of extraneous vibration interference.
Utility model content
The purpose of this utility model is for deficiency of the prior art, provides a kind of faint letter of cantilever piezoelectric film
Number sensor can effectively shield extraneous vibration interference and other interference of electromagnetic field, while ensure that piezoelectric membrane deformation is uniform,
Improve precision of the sensor for physiological parameter.
To achieve the above object, the technical scheme adopted by the utility model is that：A kind of faint letter of cantilever piezoelectric film
Number sensor, including shell, overarm brace, piezoelectric membrane and signal processing circuit, the shell is made of upper cover and lower cover
Sealing space, the overarm brace be arranged between upper cover and lower cover, described overarm brace one end by a fixed pivot with
The lower cover is fixedly connected, and the other end is vacant state, and the upper lid is equipped with contact, contact and the free end phase of overarm brace
Contact, for oppressing the free end of overarm brace, the piezoelectric membrane is close to overarm brace.
Further, formula structure is integrally formed between the upper cover and lower cover, enclosure is made to form the box sky of sealing
Between.Or bonded between the upper cover and lower cover by silicagel pad, make to form interior sealed space among shell.
Further, the shell of above-mentioned formation sealing space realizes electromagnetic shielding action, and two kinds of designing schemes may be employed：
First, shell uses the material with electromagnetic shielding action to be made；Second, housing internal surface sets electro-magnetic screen layer, electromagnetic screen
Layer is covered to be made of the material for possessing electromagnetic shielding action.
Further, the overarm brace is made of hard material.The overarm brace Bending Deformation of hard material is uniform, can
The piezoelectric membrane being close to thereon to be driven to generate uniform deformation.
Further, the signal processing circuit is integrated on pcb board, which is fixedly arranged on lower lid.
Further, matrix form row may be employed according to practical situations at least provided with one in the upper cover upper contact
It is listed on lid and multiple contacts is set.
Further, bonding place is equipped with silica gel between the upper cover and lower cover, for the seam between closed above and lower cover
Gap coordinates the relative motion between upper cover and lower cover simultaneously.
Further, the contact is column structure or vertebral body structure.
The utility model advantage is：
1st, the utility model oppresses half hanging overarm brace and piezoelectric membrane by designing contact on upper lid, makes piezoelectricity
Film is only subject to the vibration pressure of upper cover one side, can greatly reduce interference of other the extraneous vibration signals to piezoelectric membrane.
2nd, the utility model forms closure by using bonding between upper and lower covers, enhances the anti-interference of sensor
Energy.
Description of the drawings
Fig. 1 is the utility model sensor internal structure diagram in first embodiment；
Fig. 2 is the utility model sensor integrated casing structure diagram in second embodiment；
Fig. 3 is the utility model sensor outer housing upper and lower covers glued construction schematic diagram in 3rd embodiment；
Fig. 4 is the utility model sensor outer housing upper and lower covers glued construction schematic diagram in fourth embodiment.
Reference numeral and component involved in attached drawing is as follows：
1. outer casing upper cover, 2. shell lower covers, 3. overarm braces, 4. piezoelectric membranes, 5. fixed pivots,
6. contact, 7.PCB plates, 8. shell upper and lower covers bonding places.
Specific embodiment
The concrete structure of the utility model is described below in conjunction with the accompanying drawings, as shown in attached drawing 1-4, cantilever piezoelectric
Film small-signal sensor structure includes：Shell, overarm brace, piezoelectric membrane and signal processing circuit, shell by upper cover and
Lower cover forms, and the overarm brace is arranged between upper cover and lower cover, and lower lid is equipped with the fixed pivot for fixed cross beam stent,
Upper lid is equipped with the contact to connect with overarm brace, and signal processing circuit is integrated on pcb board, and pcb board is fixedly arranged on shell lower cover
On.
If attached drawing 1 is in first embodiment, in the cantilever piezoelectric film small-signal sensor of the utility model
Portion's structure diagram.In the embodiment, 3 one end of overarm brace between outer casing upper cover 1 and shell lower cover 2 is set up in by one
Fixed pivot 5 is fixedly connected with the shell lower cover 2, and the other end is vacant state.3 free end of overarm brace and outer casing upper cover 1
On contact 6 be in contact, contact 6 is used to oppress the free end of overarm brace 3, and overarm brace 3 is made to be bent downwardly deformation.Crossbeam branch
Frame 3 is made of hard materials such as phenolic resin, and with there is piezoelectric membrane 4 to be bonded to each other, piezoelectric membrane 4 can be arranged on overarm brace 3
The one side towards outer casing upper cover 1 of overarm brace 3 can also be arranged on towards the one side of shell lower cover 2.The crossbeam branch of hard material
Frame 3 is bent downwardly by the compressing of contact 6, since its hard material characteristic so that deformation is uniform, so as to drive the piezoelectricity being close to thereon
Film 4 generates uniform deformation, is conducive to improve the precision of sensor.For the fixed branch of 3 fixing end of fixed cross beam stent
Point 5 and pcb board 7 are all fixed on shell lower cover 2, and the two can also be separately fixed at shell lower cover 2 with unitary design
Different position.The signal processing circuit of sensor is integrated on pcb board 7, the not hanging end in contact with overarm brace 3 of pcb board 7,
Interference is generated so as to avoid or reduce extraneous vibration or electromagnetic field.
Contact 6 on outer casing upper cover 1 closely touches in structure with overarm brace 3, to ensure that overarm brace 3 believes vibration
Number sensibility, usual contact 6 is column structure, and cylinder bottom surface is bonded 3 surface of overarm brace completely, it is preferable that designs contact 6
For vertebral body structure, the vertex of centrum tightly touches 3 surface of overarm brace, also further enhances the sensitivity of sensor.This specification is attached
The situation for being provided only with a contact 6 is illustrated in figure, further, the contact 6 on outer casing upper cover 1 can have multiple or even can
With array arrangement on outer casing upper cover 1.
Since piezoelectric membrane has the characteristics that softness is also easy to produce deformation, as the sensor structure of first embodiment actually makes
Its anti-interference can reach product quality requirement in, therefore in the second embodiment of the utility model, such as 2 institute of attached drawing
Show, shell mechanism makes enclosure form the case of sealing using formula structure is integrally formed between outer casing upper cover 1 and shell lower cover 2
Formula space.Such shell mechanism has the effect of shielding Hz noise, can be subject to the external world in the process to avoid working sensor
Vibration or the interference of external electromagnetic field.
Further, can make between outer casing upper cover 1 and shell lower cover 2 to ensure the sealing antivibration effect of shell simultaneously
Relative motion is not obstructed, and structure bonded to each other is set between outer casing upper cover 1 and shell lower cover 2, and the two bonding place uses silica gel
It is attached.Outer casing upper cover 1 and shell lower cover 2 are respectively opposite U-shaped or hemispherical, and the two, which is mutually covered to close, forms having for shell
The structure of sealed inner.Sensor outer housing upper and lower covers glued construction such as the utility model in 3 3rd embodiment of attached drawing shows
It shown in intention, is fitted closely between 8 outer casing upper cover 1 of shell upper and lower covers bonding place and shell lower cover 2, centre uses silicagel pad by two
Person bonds.Silica gel has good antivibration effectiveness in vibration suppression, in order to further improve the vibration resistance of sensor, as attached drawing 4 the 4th is real
It applies shown in the sensor outer housing upper and lower covers glued construction schematic diagram of the utility model in example, on 8 shell of shell upper and lower covers bonding place
It is completely separated with falope ring between lid 1 and shell lower cover 2, it will not contact with each other between outer casing upper cover 1 and shell lower cover 2 completely logical
It crosses falope ring to be sealed, can preferably improve the effect of the shielding interference of sensor.
In practice, the shielding measure of sensor has very important shadow for sensor mass and using effect
It rings.Especially for small-signal sensor, good shielding measure can improve the accuracy of sensor signal.The utility model
Sensor outer housing using enclosed space can realize shielding extraneous vibration interference effect, done to further shield electromagnetism
Disturb, eliminate circuit present in power frequency electromagnetic field interference, the shell of the utility model can be made of electromagnetic shielding material or
Surface is equipped with electro-magnetic screen layer to person inside the housing, and electro-magnetic screen layer is made of the material for possessing electromagnetic shielding action.This practicality
The preparation of new shell or battery shielded layer is mixed preferably by the one or several kinds in materials described below：
(1) ferrimagnet, such as iron magnetic conduction conducting metal；
(2) nonmagnetic material, such as by the processed aluminium of electroplating surface permeability magnetic material, it is preferred to electroplate permeability magnetic material
For electronickelling etc.；
(3) nonmetallic materials of conductive magneto-conductive material are mixed；
(4) the common nonmetallic materials (such as ABS plastic) for being plated or coated with conductive magneto-conductive material are passed through on surface；
(5) battery shielding layer choosing copper foil, is attached at housing internal surface.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
Art personnel on the premise of the utility model principle is not departed from, can also make several improvement and supplement, these are improved and supplement
Also it should be regarded as the scope of protection of the utility model.
Claims (10)
1. a kind of cantilever piezoelectric film small-signal sensor, including shell, overarm brace, piezoelectric membrane and signal processing
Circuit, which is characterized in that the sealing space that the shell is made of upper cover and lower cover, the overarm brace are arranged on upper cover under
Between lid, described overarm brace one end is fixedly connected by a fixed pivot with the lower cover, and the other end is vacant state, institute
Lid is stated equipped with contact, contact is in contact with the free end of overarm brace, for oppressing the free end of overarm brace, the pressure
Conductive film is close to overarm brace.
2. a kind of cantilever piezoelectric film small-signal sensor according to claim 1, which is characterized in that on described
Formula structure is integrally formed between lid and lower cover, enclosure is made to form the box space of sealing.
3. a kind of cantilever piezoelectric film small-signal sensor according to claim 1, which is characterized in that on described
It is bonded between lid and lower cover by silicagel pad, makes to form inner space among shell.
4. a kind of cantilever piezoelectric film small-signal sensor according to claim 1, which is characterized in that described outer
Shell interior surface is equipped with electro-magnetic screen layer.
5. a kind of cantilever piezoelectric film small-signal sensor according to claim 1, which is characterized in that described outer
Shell is made of electromagnetic shielding material.
A kind of 6. cantilever piezoelectric film small-signal sensor according to claim 1, which is characterized in that the horizontal stroke
Boom support is made of hard material.
A kind of 7. cantilever piezoelectric film small-signal sensor according to claim 4 or 5, which is characterized in that institute
It states signal processing circuit to be integrated on pcb board, which is fixedly arranged on lower lid.
8. a kind of cantilever piezoelectric film small-signal sensor according to claim 1, which is characterized in that on described
Contact is covered at least provided with one.
9. a kind of cantilever piezoelectric film small-signal sensor according to claim 3, which is characterized in that on described
Bonding place is equipped with silica gel between lid and lower cover, coordinates simultaneously between upper cover and lower cover for the gap between closed above and lower cover
Relative motion.
10. a kind of cantilever piezoelectric film small-signal sensor according to claim 1, which is characterized in that described
Contact is column structure or vertebral body structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721563410.2U CN207456474U (en) | 2017-11-21 | 2017-11-21 | Cantilever piezoelectric film small-signal sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721563410.2U CN207456474U (en) | 2017-11-21 | 2017-11-21 | Cantilever piezoelectric film small-signal sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207456474U true CN207456474U (en) | 2018-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721563410.2U Active CN207456474U (en) | 2017-11-21 | 2017-11-21 | Cantilever piezoelectric film small-signal sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207456474U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109770884A (en) * | 2019-01-31 | 2019-05-21 | 传世未来（北京）信息科技有限公司 | Vibrating sensor and fetal rhythm monitoring device for organism vibration detection |
-
2017
- 2017-11-21 CN CN201721563410.2U patent/CN207456474U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109770884A (en) * | 2019-01-31 | 2019-05-21 | 传世未来（北京）信息科技有限公司 | Vibrating sensor and fetal rhythm monitoring device for organism vibration detection |
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