CN104638973B - Piezoelectric actuator and Braille display structured thereby - Google Patents
Piezoelectric actuator and Braille display structured thereby Download PDFInfo
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- CN104638973B CN104638973B CN201410664275.5A CN201410664275A CN104638973B CN 104638973 B CN104638973 B CN 104638973B CN 201410664275 A CN201410664275 A CN 201410664275A CN 104638973 B CN104638973 B CN 104638973B
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Abstract
The invention discloses a piezoelectric actuator and a Braille display structure thereby. The panel of each Braille code in each Braille array of the Braille display is provided with six holes, and one piezoelectric actuator is disposed corresponding to each hole under the panel. Each piezoelectric actuator comprises a stripped metal sheet extending along the cylindrical spiral line, a first piezoelectric patch and a second piezoelectric patch, and both the first surface of the first piezoelectric patch and the first surface of the second piezoelectric patch are jointed with the second surface, back to a revolving shaft of the cylindrical spiral line, of the metal sheet; the metal sheet is grounded, and a first electrode and a second electrode used for loading driving voltage are respectively arranged on the second surface of the first piezoelectric patch and the second surface of the second piezoelectric patch. The piezoelectric actuators adopt spiral structures, thereby being small in space occupation. The Braille display is simple and compact in structure and rapid in response, and closely-spaced array can be realized.
Description
Technical field
The present invention relates to piezoelectric actuated technology, the Braille display of more particularly, to a kind of piezo-activator and its construction.
Background technology
Braille display or title braille terminal, braille display, are the electronics that can carry out information output in the form of braille
Mechanical equipment.Its specific practice is：The hole that with good grounds braille arranges in the plane of display, shows as needed
Letter, makes some points protrude from hole, visually impaired person can be touched, and thus knows corresponding information.Therefore, have blind
Civilian display help it is impossible to using general display device blind, visually impaired user also being capable of reading information.
At present, Braille display more applies piezo-activator to construct.Piezo-activator is to utilize piezoelectric ceramics
Inverse piezoelectric effect, cause the deformation of piezoelectric ceramics by applied voltage, thus the letter showing as needed, make some points from
Protrude or non-bulging in hole, that to realize braille contact shows effect especially.Compared with traditional mechanical type Braille display, piezoelectricity
The Braille display of actuator construction has many features and advantage：
1st, compact conformation；
2nd, fast response time.
In general, the operation principle showing dot matrix Braille display especially of traditional piezoelectric actuator constructions is, to piezoelectricity
Unit applied voltage is so as to volume increases, then passes through lever principle, so that the point of determination is protruded from hole, is achieved in showing especially
Effect.But, the showing especially in dot matrix Braille display of this kind of piezoelectric actuator constructions, lever construction occupies much room,
It is unable to dense arrangement dot matrix.Therefore, its often size larger, be unfavorable for carrying；And once the letter that shows is less, user is very
Difficult quick obtaining bulk information.
Therefore, those skilled in the art is devoted to developing the Braille display of a kind of piezo-activator and its construction, real
Existing dense arrangement dot matrix.
Content of the invention
In view of the drawbacks described above of prior art, the technical problem to be solved is to provide a kind of piezo-activator
And its Braille display of construction.
For achieving the above object, the invention provides a kind of piezo-activator, including first end and the second end；Described
After piezo-activator is applied in driving voltage, described the second end is in the first direction away from described first end；Described piezoelectricity causes
After dynamic device is revoked described driving voltage, described the second end replys its initial bit along direction opposite to the first direction
Put；It is characterized in that, the first piezoelectric patches including strip and the second piezoelectric patches, described first piezoelectric patches and described second piezoelectric patches
It is connected insulated from each otherly and extends in the shape of a spiral, being oriented parallel to of described first piezoelectric patches described second piezoelectric patches of sensing is described
First direction.
Further, described first piezoelectric patches and described second piezoelectric patches extend along circular helix, described cylindrical screw
The rotary shaft of line is along described first direction.
Further, the first surface of described first piezoelectric patches is towards the rotary shaft of described circular helix, and described first
The rotary shaft of the second surface of piezoelectric patches dorsad described circular helix；The first surface of described second piezoelectric patches is towards described circle
The rotary shaft of post helix, the rotary shaft of the second surface of described second piezoelectric patches dorsad described circular helix；Described first
The first surface ground connection of the first surface of piezoelectric patches and described second piezoelectric patches, the second surface of described first piezoelectric patches has
First electrode, the second surface of described second piezoelectric patches has second electrode.
Alternatively, the polarised direction of described first piezoelectric patches is the normal side of the first surface along described first piezoelectric patches
To the polarised direction of described second piezoelectric patches is along the side contrary with the normal direction of the first surface of described second piezoelectric patches
To described first electrode is positive pole, and described second electrode is positive pole.
Alternatively, the polarised direction of described first piezoelectric patches is the normal side of the first surface along described first piezoelectric patches
To the polarised direction of described second piezoelectric patches is the normal direction of the first surface along described second piezoelectric patches, described first electricity
Extremely positive pole, described second electrode is negative pole.
Further, one end of one end of described first piezoelectric patches and described second piezoelectric patches forms described first end,
The other end of the other end of described first piezoelectric patches and described second piezoelectric patches forms described the second end.
Further, also include the sheet metal of strip, the first surface of described sheet metal is towards described circular helix
Rotary shaft, the rotary shaft of the second surface of described sheet metal dorsad described circular helix, the second surface of described sheet metal with
The first surface of the first surface of described first piezoelectric patches and described second piezoelectric patches engages, described sheet metal ground connection.
Further, one end of one end of described first piezoelectric patches, one end of described second piezoelectric patches and described sheet metal
Form described first end, the other end of described first piezoelectric patches, the other end of described second piezoelectric patches and described sheet metal
The other end forms described the second end.
The invention also discloses a kind of Braille display, the piezo-activator structure described in any preceding Claim
Make it is characterised in that including some word arrays, each of described word array braille includes panel, and described panel has many
Individual hole, below described panel, each described hole corresponding is disposed with a described piezo-activator, the institute of described piezo-activator
State first end to be fixed, described the second end is provided with contact, after described piezo-activator is applied in driving voltage, described
Contact protrudes from described panel from described hole；After described piezo-activator is revoked described driving voltage, described contact is from described
Hole returns to below described panel.
Further, the plurality of hole is arranged into the array of 3 row 2 row.
In the better embodiment of the present invention, there is provided the Braille display of a kind of piezo-activator and its construction, its
Middle Braille display includes a word array, and the panel of each braille has 6 holes of 3 row 2 row arrangement, under panel
Side each hole corresponding is disposed with a piezo-activator.Piezo-activator includes the metal of the strip along circular helix extension
Piece, the first piezoelectric patches and the second piezoelectric patches, the first surface of the wherein first piezoelectric patches and the first surface of the second piezoelectric patches all with
The second surface of the rotary shaft of dorsad circular helix of sheet metal engages.The polarised direction of the first piezoelectric patches is along its first table
The normal direction in face, the polarised direction of the second piezoelectric patches is along the direction contrary with the normal direction of its first surface.Sheet metal
Ground connection, the second surface of the first piezoelectric patches has first electrode, the second surface of the second piezoelectric patches has second electrode, the
One electrode and second electrode are all positive pole.One end of one end of the first piezoelectric patches, one end of the second piezoelectric patches and sheet metal is formed
The first end of piezo-activator, the other end shape of the other end of the first piezoelectric patches, the other end of the second piezoelectric patches and sheet metal
Become the second end of piezo-activator.In the lower section of the panel of each braille, the first end of piezo-activator is with respect to panel quilt
Fixing, the second end is provided with contact.After piezo-activator is applied in driving voltage, its second end is with respect to first end
Portion pops up, and band movable contact makes it protrude from panel from corresponding hole；After piezo-activator is revoked driving voltage, the
Its initial position is replied downwards in two ends, and band movable contact makes it return to below panel from this hole.
As can be seen here, the piezo-activator of the present invention adopts helical structure, and it takes up room less, is therefore constructed by it
Braille display is capable of dense arrangement dot matrix.The Braille display structure letter of the piezo-activator of the present invention and its construction
Single, compact, response is very fast, has marked improvement at aspects such as function and application prospects compared with traditional Braille display.
Technique effect below with reference to design, concrete structure and generation to the present invention for the accompanying drawing is described further, with
It is fully understood from the purpose of the present invention, feature and effect.
Brief description
Fig. 1 shows the point word array of the Braille display of the present invention.
Fig. 2 is the schematic diagram of one of the point word array shown in Fig. 1 braille.
Fig. 3 is the structural representation of the piezo-activator of the present invention.
Fig. 4 shows the structure of the second end of the piezo-activator shown in Fig. 3.
Specific embodiment
As shown in figure 1, in a preferred embodiment, the Braille display 1 of the present invention includes a word array, and it is by many
The individual braille arrangement as braille 10 is formed, and the point word array of the Braille display 1 in the present embodiment is the point of a dense arrangement
Battle array, that is, the distance between adjacent braille of any two can accomplish very little (less than the 1/10 of the length of braille or width).
The structure of braille 10 is as shown in Fig. 2 it includes panel 400.The array arrangement of the row in 3 row 2 is provided with panel 400
6 holes, such as hole 300.Below panel 400, each hole corresponding is disposed with a piezo-activator.
The piezoelectric actuator 100 of the piezoelectric actuator of the present invention such as corresponding aperture 300, as shown in Figures 3 and 4, piezoelectric actuator
100 is helical structure, and its first end (in figure 3 at the bottom of shown helical structure) is fixing with respect to panel 400, that is, its
Remain static with respect to panel 400；Its second end (in figure 3 at the top of shown helical structure) and contact 200
It is connected.Contact 200 can be connected to the second end by modes such as bonding, welding.
The sheet metal 110 of strip that piezoelectric actuator 100 includes extending along circular helix, the first piezoelectric patches 121 and the
Two piezoelectric patches 122.One end of first piezoelectric patches 121, one end of the second piezoelectric patches 122 are formed together with one end of sheet metal 110
The first end of piezo-activator 100, the other end of the first piezoelectric patches 121, the other end of the second piezoelectric patches 122 and sheet metal
110 other end forms the second end of piezo-activator 100 together.
Circular helix is that dynamic point makees constant speed screw around cylinder axis on the face of cylinder, makees constant speed simultaneously and vertically
The track of linear motion, cylinder axis therein are referred to as the rotary shaft of this circular helix.This circular helix has spiral
Radius R, pitch h, wherein radius of spin R are the vertical dimension of any point on circular helix to rotary shaft, i.e. above-mentioned cylinder
The radius in face；Pitch is helical pitch (dynamic point rotates a circle, its height rising vertically).In the present embodiment, piezoelectric actuator 100
Helical structure radius of spin R be 3mm, pitch h be 0.7mm；From first end to the second end, the number of turns of helical structure is
20.
Sheet metal 100 has first surface and second surface, and wherein, its first surface (i.e. should towards above-mentioned rotary shaft
The normal direction of first surface points to this rotary shaft), the dorsad above-mentioned rotary shaft of its second surface (the i.e. normal of this second surface
Direction dorsad this rotary shaft).In addition, the first piezoelectric patches 121 has first surface and second surface, wherein, its first surface court
To above-mentioned rotary shaft, the dorsad above-mentioned rotary shaft of its second surface；Second piezoelectric patches 122 also has first surface and the second table
Face, wherein, its first surface is towards above-mentioned rotary shaft, the dorsad above-mentioned rotary shaft of its second surface.
As shown in figure 4, wherein, the first surface of the first surface of the first piezoelectric patches 121 and the second piezoelectric patches 122 all with gold
The second surface belonging to piece 110 engages.Between first piezoelectric patches 121 and the second piezoelectric patches 122, there is insulation system 130, so that the
One piezoelectric patches 121 is connected insulated from each otherly with the second piezoelectric patches 122.Herein connected is indirectly to be connected, and it can be adopted
First piezoelectric patches 121 and the second piezoelectric patches 122 are connected or adopt space by the insulation system 130 that insulant makes
As insulation system 130, and the first piezoelectric patches 121 is connected by sheet metal 110 with the second piezoelectric patches 122.
Sheet metal 110 has width b and thickness h 1, and in the present embodiment, the first piezoelectric patches 121 and the second piezoelectric patches 122 have
Identical width 1/2b and thickness h 2, the width of insulation system 130 is with respect to the first piezoelectric patches 121 and the second piezoelectric patches 122
Width can ignore (less than the 1/10 of the first piezoelectric patches 121 and the width of the second piezoelectric patches 122), and its thickness is equal to the first piezoelectricity
Piece 121 and the thickness h 2 of the second piezoelectric patches 122.In the present embodiment, the width b of sheet metal 110 is 0.6mm, and thickness h 1 is
0.5mm, the width of the first piezoelectric patches 121 and the second piezoelectric patches 122 is 0.3mm, and thickness h 2 is 0.1mm, the thickness of insulation system 130
Spend for 0.1mm.
In the present embodiment, sheet metal 110 is grounded, and the second surface of the first piezoelectric patches 121 has first electrode, the second pressure
Second electrode is had on the second surface of electricity 122, first electrode and second electrode are used for load driver voltage.The present invention's
It is also possible to be loaded into driving voltage on sheet metal in other embodiment, and by the first piezoelectric patches and the second piezoelectric patches not with gold
Belong to the surface earthing of chip bonding.
In the present embodiment, the polarised direction of the first piezoelectric patches 121 is the normal direction along its first surface, the second piezoelectric patches
122 polarised direction is along the direction contrary with the normal direction of its first surface, and first electrode and second electrode are all positive pole.
So, when first electrode and second electrode load positive driving voltage U, the first piezoelectric patches 121 is stretched in its longitudinal direction
Long, the second piezoelectric patches 122 shortens in its longitudinal direction.Popped up by the second end of this piezoelectric actuator 100, send out
The raw motion away from first end, thus carries movable contact 200, contact 200 protrudes from panel 400 from hole 300, with by user
Perception.After the driving voltage U that revocation is carried in first electrode and second electrode, the first piezoelectric patches 121 and the second piezoelectric patches
122 its original length of reply, are moved down by the second end of this piezoelectric actuator 100 and are returned to its initial position, thus carry
Movable contact 200, under hole 300 is back down to panel 400, the person of being no longer used perceives for contact 200.In the present embodiment, load
Driving voltage U be 25V when, contact 200 moves up about 0.545mm from its initial position.
Furthermore it is also possible to adopt polarised direction identical the first piezoelectric patches 121 and the second piezoelectric patches 122, i.e. the first piezoelectricity
The polarised direction of piece 121 is the normal direction along its first surface, and the polarised direction of the second piezoelectric patches 122 is also along its first table
The normal direction in face, at this moment, second electrode can also make piezoelectric actuator 100 drive as negative pole as positive pole to set first electrode
Above-mentioned motion is realized in the presence of galvanic electricity pressure.
It will be understood to those skilled in the art that the piezoelectric actuator of the present invention can also be without using sheet metal, only with
First and second piezoelectric patches of above-mentioned configuration, arrange electrode on their first and second surface in the way of foregoing description is similar
Also can make piezoelectric actuator that above-mentioned motion occurs in the presence of driving voltage.
When making the piezoelectric actuator of the present invention, below step can be adopted (to carry out taking piezoelectric actuator 100 as a example
Illustrate)：
Make the sheet metal 110 of above-mentioned helical structure；Make the first pressure in the top half of the second surface of sheet metal 110
Electric piece 121, in the way of using direct spraying piezoceramic material, or can block sheet metal 110 using first making mask here
Surface on do not need that the part making the first piezoelectric patches 121 sprays, evaporates, sputtering or depositing piezoelectric ceramic membrane removes again
The mode of mask is realized；Make insulation system in the lower section of the centre of the second surface of sheet metal 110, the first piezoelectric patches 121
130, here using by the way of with make the first piezoelectric patches 121 mode can be identical；Finally, the second surface of sheet metal 110
The latter half make the second piezoelectric patches 122, this employing by the way of with making the first piezoelectric patches 121 mode can be identical.
The preferred embodiment of the present invention described in detail above.It should be appreciated that those of ordinary skill in the art is no
Need creative work just can make many modifications and variations according to the design of the present invention.Therefore, the technology of all the art
It is available that personnel pass through logical analysis, reasoning, or a limited experiment under this invention's idea on the basis of existing technology
Technical scheme, all should be in the protection domain being defined in the patent claims.
Claims (2)
1. a kind of piezo-activator, including first end and the second end；After described piezo-activator is applied in driving voltage, institute
State the second end in the first direction away from described first end；After described piezo-activator is revoked described driving voltage, described
The second end replys its initial position along direction opposite to the first direction；It is characterized in that, including the first pressure of strip
Electric piece and the second piezoelectric patches, described first piezoelectric patches is connected and extends in the shape of a spiral insulated from each otherly with described second piezoelectric patches,
Described first piezoelectric patches point to described second piezoelectric patches be oriented parallel to described first direction；
Wherein said first piezoelectric patches is extended along circular helix with described second piezoelectric patches, the rotary shaft of described circular helix
Along described first direction；
The first surface of wherein said first piezoelectric patches towards the rotary shaft of described circular helix, the of described first piezoelectric patches
The rotary shaft of two surfaces dorsad described circular helix；The first surface of described second piezoelectric patches is towards described circular helix
Rotary shaft, the rotary shaft of the second surface of described second piezoelectric patches dorsad described circular helix；The of described first piezoelectric patches
The first surface ground connection of one surface and described second piezoelectric patches, the second surface of described first piezoelectric patches has first electrode,
On the second surface of described second piezoelectric patches, there is second electrode；
The polarised direction of wherein said first piezoelectric patches is the normal direction of the first surface along described first piezoelectric patches, described
The polarised direction of two piezoelectric patches is the edge direction contrary with the normal direction of the first surface of described second piezoelectric patches, described first
Electrode is positive pole, and described second electrode is positive pole；
Or the normal direction that the polarised direction of wherein said first piezoelectric patches is the first surface along described first piezoelectric patches, institute
The polarised direction stating the second piezoelectric patches is the normal direction of the first surface along described second piezoelectric patches, and described first electrode is just
Pole, described second electrode is negative pole；
One end of one end of wherein said first piezoelectric patches and described second piezoelectric patches forms described first end, described first pressure
The other end of the other end of electric piece and described second piezoelectric patches forms described the second end；
Or wherein also include the sheet metal of strip, the first surface of described sheet metal is towards the rotation of described circular helix
Axle, the rotary shaft of the second surface of described sheet metal dorsad described circular helix, the second surface of described sheet metal with described
The first surface of the first surface of the first piezoelectric patches and described second piezoelectric patches engages, described sheet metal ground connection；Wherein said
One end of one end of one piezoelectric patches, one end of described second piezoelectric patches and described sheet metal forms described first end, and described
The other end of the other end of one piezoelectric patches, the other end of described second piezoelectric patches and described sheet metal forms described the second end.
2. a kind of Braille display, by the piezoelectric actuator constructions described in claim 1 it is characterised in that including point word array,
Each of described word array braille includes panel, and described panel has multiple holes, corresponds to each below described panel
Described hole is disposed with a described piezo-activator, and the described first end of described piezo-activator is fixed, described second end
It is provided with contact, after described piezo-activator is applied in driving voltage, described contact protrudes from described panel from described hole in portion；
After described piezo-activator is revoked described driving voltage, described contact returns to below described panel from described hole；Wherein said
Multiple holes are arranged into the array of 3 row 2 row.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410664275.5A CN104638973B (en) | 2014-11-19 | 2014-11-19 | Piezoelectric actuator and Braille display structured thereby |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410664275.5A CN104638973B (en) | 2014-11-19 | 2014-11-19 | Piezoelectric actuator and Braille display structured thereby |
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| Publication Number | Publication Date |
|---|---|
| CN104638973A CN104638973A (en) | 2015-05-20 |
| CN104638973B true CN104638973B (en) | 2017-02-22 |
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| CN201410664275.5A Expired - Fee Related CN104638973B (en) | 2014-11-19 | 2014-11-19 | Piezoelectric actuator and Braille display structured thereby |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054950A (en) * | 2017-12-21 | 2018-05-18 | 哈尔滨工业大学 | A kind of artificial-muscle of inverse piezoelectric effect driving |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111312027A (en) * | 2018-12-11 | 2020-06-19 | 北京纳米能源与系统研究所 | Micro motor, driver and braille display based on polylactic acid piezoelectric film |
| CN111932992B (en) * | 2020-08-26 | 2021-12-10 | 北京红点互联技术研发有限公司 | Braille display module and Braille display device |
| CN113593373A (en) * | 2020-12-10 | 2021-11-02 | 宁波大学 | Braille dynamic contact unit based on piezoelectric ultrasonic vibration and Braille touch perception device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2016501A (en) * | 1999-12-21 | 2001-07-03 | 1... Limited | Electro-active devices |
| JP4288873B2 (en) * | 2000-07-24 | 2009-07-01 | オムロン株式会社 | Actuator and actuator manufacturing method |
| FR2871270B1 (en) * | 2004-06-07 | 2006-08-11 | Commissariat Energie Atomique | TOUCH DISPLAY DEVICE |
| KR100676735B1 (en) * | 2005-09-27 | 2007-02-02 | (주)모이텍 | A device for emboding a braille |
| WO2011089803A1 (en) * | 2010-01-20 | 2011-07-28 | 株式会社村田製作所 | Piezoelectric electricity generating element, piezoelectric electricity generating device and production method for piezoelectric electricity generating element |
| CN102263199B (en) * | 2011-08-10 | 2013-07-31 | 边义祥 | Distributed electrode type core-containing piezoelectric rod spring |
| CN104065299B (en) * | 2014-06-26 | 2016-07-06 | 北京航空航天大学 | The piezoelectric ceramic actuator of a kind of spring shape and the method obtaining big stroke |
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2014
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054950A (en) * | 2017-12-21 | 2018-05-18 | 哈尔滨工业大学 | A kind of artificial-muscle of inverse piezoelectric effect driving |
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