CN104638973A - Piezoelectric actuator and Braille display structured thereby - Google Patents
Piezoelectric actuator and Braille display structured thereby Download PDFInfo
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- CN104638973A CN104638973A CN201410664275.5A CN201410664275A CN104638973A CN 104638973 A CN104638973 A CN 104638973A CN 201410664275 A CN201410664275 A CN 201410664275A CN 104638973 A CN104638973 A CN 104638973A
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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, particularly relate to the Braille display of a kind of piezo-activator and structure thereof.
Background technology
Braille display or title braille terminal, braille display are the electronic mechanical equipment that can carry out information output with the form of braille.Its concrete practice is: the hole that with good grounds braille arranges in the plane of display, the letter shown as required, and some point is protruded from hole, allows can to touch depending on barrier person, and knows corresponding information thus.Therefore, had the help of Braille display, cannot use general display device blind, also can reading information depending on barrier user.
At present, Braille display more applies piezo-activator to construct.Piezo-activator is the inverse piezoelectric effect utilizing piezoelectric ceramic, causes the distortion of piezoelectric ceramic by applying voltage, thus the letter shown as required, make some point protrude from hole or not protrude, what realize braille contact shows effect especially.Compared with traditional mechanical type Braille display, the Braille display of piezoelectric actuator constructions has many features and advantage:
1, compact conformation;
2, fast response time.
In general, the operation principle showing dot matrix Braille display especially of traditional piezoelectric actuator constructions is, applies voltage, its volume is increased to piezoelectricity unit, then by lever principle, the point determined is protruded from hole, realizes the effect shown especially thus.But, this kind of piezoelectric actuator constructions show especially in dot matrix Braille display, lever construction occupies very large space, can not dense arrangement dot matrix.Therefore, often size is comparatively large for it, is unfavorable for carrying; And the letter once shown is less, user is difficult to quick obtaining bulk information.
Therefore, those skilled in the art is devoted to the Braille display developing a kind of piezo-activator and structure thereof, realizes dense arrangement dot matrix.
Summary of the invention
Because the above-mentioned defect of prior art, technical problem to be solved by this invention is to provide the Braille display of a kind of piezo-activator and structure thereof.
For achieving the above object, the invention provides a kind of piezo-activator, comprise first end and the second end; After described piezo-activator is applied in driving voltage, described the second end along first direction away from described first end; After described piezo-activator is cancelled described driving voltage, described the second end replys its initial position along direction opposite to the first direction; It is characterized in that, comprise the first piezoelectric patches and second piezoelectric patches of strip, described first piezoelectric patches and described second piezoelectric patches are connected and extend in the shape of a spiral insulated from each otherly, and the direction that described first piezoelectric patches points to described second piezoelectric patches is parallel to described first direction.
Further, described first piezoelectric patches and described second piezoelectric patches extend along circular helix, and the rotating shaft of described circular helix is along described first direction.
Further, the first surface of described first piezoelectric patches towards the rotating shaft of described circular helix, the rotating shaft of the second surface of described first piezoelectric patches described circular helix dorsad; The first surface of described second piezoelectric patches towards the rotating shaft of described circular helix, the rotating shaft of the second surface of described second piezoelectric patches described circular helix dorsad; The first surface of described first piezoelectric patches and the first surface ground connection of described second piezoelectric patches, the second surface of described first piezoelectric patches has the first electrode, the second surface of described second piezoelectric patches has the second electrode.
Alternatively, the polarised direction of described first piezoelectric patches is the normal direction of the first surface along described first piezoelectric patches, the polarised direction of described second piezoelectric patches is along the 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.
Alternatively, the polarised direction of described first piezoelectric patches is the normal direction of the first surface along described first piezoelectric patches, the polarised direction of described second piezoelectric patches is the normal direction of the first surface along described second piezoelectric patches, and described first electrode is positive pole, and described second electrode is negative pole.
Further, one end of described first piezoelectric patches and one end of described second piezoelectric patches form described first end, and the other end of described first piezoelectric patches and the other end of described second piezoelectric patches form described the second end.
Further, also comprise the sheet metal of strip, the first surface of described sheet metal is towards the rotating shaft of described circular helix, the rotating shaft of the second surface of described sheet metal described circular helix dorsad, the second surface of described sheet metal engages with the first surface of the first surface of described first piezoelectric patches and described second piezoelectric patches, described sheet metal ground connection.
Further, one end of described first piezoelectric patches, one end of described second piezoelectric patches and one end of described sheet metal form described first end, and the other end of described first piezoelectric patches, the other end of described second piezoelectric patches and the other end of described sheet metal form described the second end.
The invention also discloses a kind of Braille display, by the piezoelectric actuator constructions described in any preceding Claim, it is characterized in that, comprise a word array, each braille in described some word array comprises panel, described panel has multiple hole, a described piezo-activator is furnished with in the corresponding each described hole of described lower panels, the described first end of described piezo-activator is 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 cancelled described driving voltage, described lower panels is got back to from described hole in described contact.
Further, described multiple hole is arranged into the array that 3 row 2 arrange.
In better embodiment of the present invention, provide the Braille display of a kind of piezo-activator and structure thereof, wherein Braille display comprises a word array, and the panel of each braille wherein has 6 holes that 3 row 2 arrange arrangement, is furnished with a piezo-activator in the corresponding each hole of lower panels.Piezo-activator comprises the sheet metal of strip, the first piezoelectric patches and the second piezoelectric patches that extend along circular helix, and wherein the first surface of the first piezoelectric patches and the first surface of the second piezoelectric patches all engage with the second surface of the rotating shaft of the circular helix dorsad of sheet metal.The polarised direction of the first piezoelectric patches is the normal direction along its first surface, and 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 the first electrode, the second surface of the second piezoelectric patches has the second electrode, and the first electrode and the second electrode are all positive pole.One end of one end of first piezoelectric patches, one end of the second piezoelectric patches and sheet metal forms the first end of piezo-activator, and the other end of the other end of the first piezoelectric patches, the other end of the second piezoelectric patches and sheet metal forms the second end of piezo-activator.In the below of the panel of each braille, the first end of piezo-activator is fixed relative to panel, and the second end is provided with contact.After piezo-activator is applied in driving voltage, its second end pops up relative to first end, and band moving contact makes it from the hole of correspondence, protrude from panel; After piezo-activator is cancelled driving voltage, the second end replys its initial position downwards, and band moving contact makes it get back to lower panels from this hole.
As can be seen here, piezo-activator of the present invention adopts helical structure, and it takes up room less, therefore can realize dense arrangement dot matrix by the Braille display of its structure.The Braille display structure of piezo-activator of the present invention and structure thereof is simple, compact, and response is very fast, in function and application prospect etc., have marked improvement compared with traditional Braille display.
Be described further below with reference to the technique effect of accompanying drawing to design of the present invention, concrete structure and generation, to understand object of the present invention, characteristic sum effect fully.
Accompanying drawing explanation
Fig. 1 shows the some word array of Braille display of the present invention.
Fig. 2 is the schematic diagram of a braille in the some word array shown in Fig. 1.
Fig. 3 is the structural representation of piezo-activator of the present invention.
Fig. 4 shows the structure of the second end of the piezo-activator shown in Fig. 3.
Embodiment
As shown in Figure 1, in a better embodiment, Braille display 1 of the present invention comprises a word array, it is arranged by multiple braille as braille 10 and is formed, the point word array of the Braille display 1 in the present embodiment is the dot matrix of a dense arrangement, and the distance namely between any two adjacent brailles can be accomplished very little (being less than the length of braille or 1/10 of width).
As shown in Figure 2, it comprises panel 400 to the structure of braille 10.Panel 400 is provided with 6 holes of the array arrangement arranged in 3 row 2, as hole 300.Below panel 400, corresponding each hole is furnished with a piezo-activator.
Piezoelectric actuator of the present invention is as the piezoelectric actuator 100 of corresponding aperture 300, as shown in Figures 3 and 4, piezoelectric actuator 100 is helical structure, its first end (the bottom place of the helical structure in figure 3) is fixed relative to panel 400, and namely it remains static relative to panel 400; Its second end (the top place of the helical structure in figure 3) is connected with contact 200.Contact 200 can be connected to the second end by modes such as bonding, welding.
Piezoelectric actuator 100 comprises sheet metal 110, first piezoelectric patches 121 and second piezoelectric patches 122 of the strip extended along circular helix.One end of first piezoelectric patches 121, one end of the second piezoelectric patches 122 form the first end of piezo-activator 100 together with one end of sheet metal 110, and the other end of the first piezoelectric patches 121, the other end of the second piezoelectric patches 122 form the second end of piezo-activator 100 together with the other end of sheet metal 110.
Circular helix is a little on the face of cylinder, to do constant speed screw around cylinder axis, and make again the track of uniform rectilinear motion vertically, cylinder axis is wherein referred to as the rotating shaft of this circular helix simultaneously.This circular helix has radius of spin R, pitch h, wherein radius of spin R be on circular helix any point to the vertical range of rotating shaft, i.e. the radius on the above-mentioned face of cylinder; Pitch and helical pitch (dynamic point rotates a circle, its height risen vertically).In the present embodiment, the radius of spin R of the helical structure of piezoelectric actuator 100 is 3mm, pitch h is 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, wherein, its first surface towards above-mentioned rotating shaft (namely the normal direction of this first surface points to this rotating shaft), the rotating shaft (i.e. the normal direction of this second surface this rotating shaft dorsad) that its second surface is above-mentioned dorsad.In addition, the first piezoelectric patches 121 has first surface and second surface, wherein, its first surface towards above-mentioned rotating shaft, the rotating shaft that its second surface is above-mentioned dorsad; Second piezoelectric patches 122 also has first surface and second surface, wherein, its first surface towards above-mentioned rotating shaft, the rotating shaft that its second surface is above-mentioned dorsad.
As shown in Figure 4, wherein, the first surface of the first piezoelectric patches 121 and the first surface of the second piezoelectric patches 122 all engage with the second surface of sheet metal 110.Between first piezoelectric patches 121 and the second piezoelectric patches 122, there is insulation system 130, with make the first piezoelectric patches 121 and the second piezoelectric patches 122 insulated from each other be connected.Herein connected is indirectly connected, it can be that the first piezoelectric patches 121 is connected with the second piezoelectric patches 122 by the insulation system 130 adopting insulating material to make, also can be adopt space as insulation system 130, and the first piezoelectric patches 121 be connected by sheet metal 110 with the second piezoelectric patches 122.
Sheet metal 110 has width b and thickness h 1, 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 can be ignored (being less than 1/10 of the width of the first piezoelectric patches 121 and the second piezoelectric patches 122) relative to the width of the first piezoelectric patches 121 and the second piezoelectric patches 122, and its thickness equals the thickness h 2 of the first piezoelectric patches 121 and 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, and the width of the first piezoelectric patches 121 and the second piezoelectric patches 122 is 0.3mm, and thickness h 2 is 0.1mm, and the thickness of insulation system 130 is 0.1mm.
In the present embodiment, sheet metal 110 ground connection, the second surface of the first piezoelectric patches 121 has the first electrode, and the second surface of the second 122, piezoelectricity has the second electrode, and the first electrode and the second electrode are used for load driver voltage.In other embodiments of the invention, also driving voltage can be loaded on sheet metal, and by surface earthing that the first piezoelectric patches and the second piezoelectric patches do not engage with sheet metal.
In the present embodiment, the polarised direction of the first piezoelectric patches 121 is the normal direction along its first surface, and the polarised direction of the second piezoelectric patches 122 is that the first electrode and the second electrode are all positive pole along the direction contrary with the normal direction of its first surface.Like this, when the first electrode and the second electrode load positive driving voltage U, the first piezoelectric patches 121 extends in their length direction, and the second piezoelectric patches 122 shortens in their length direction.The second end of piezoelectric actuator 100 pops up thus, and the motion away from first end occurs, and be with moving contact 200 thus, contact 200 protrudes from panel 400 from hole 300, with by user's perception.After cancelling the driving voltage U be carried on the first electrode and the second electrode, first piezoelectric patches 121 and the second piezoelectric patches 122 reply its original length, the second end of piezoelectric actuator 100 moves down and is returned to its initial position thus, be with moving contact 200 thus, contact 200 is got back under panel 400 downwards from hole 300, no longer by user's perception.In the present embodiment, when the driving voltage U of loading is 25V, contact 200 to move up about 0.545mm from its initial position.
In addition, first piezoelectric patches 121 and second piezoelectric patches 122 that polarised direction can also be adopted identical, namely the polarised direction of the first piezoelectric patches 121 is the normal direction along its first surface, the polarised direction of the second piezoelectric patches 122 is also the normal direction along its first surface, at this moment, set the first electrode and be positive pole and the second electrode is negative pole that piezoelectric actuator 100 also can be made under the effect of driving voltage to realize above-mentioned motion.
It will be appreciated by those skilled in the art that, piezoelectric actuator of the present invention can not also use sheet metal, only adopt the first and second piezoelectric patches of above-mentioned configuration, arrange in the mode that their first and second surface is similar with foregoing description, under electrode also can make the effect of piezoelectric actuator at driving voltage, above-mentioned motion occurs.
When making piezoelectric actuator of the present invention, following step (being described for piezoelectric actuator 100) can be adopted:
Make the sheet metal 110 of above-mentioned helical structure; The first piezoelectric patches 121 is made in the first half of the second surface of sheet metal 110, here can adopt the mode of direct spraying piezoceramic material, or adopt first to make on surface that mask blocks sheet metal 110 and do not need the part of making first piezoelectric patches 121 to spray again, evaporate, to sputter or the mode that mask removed again by depositing piezoelectric ceramic membrane realizes; In the centre of the second surface of sheet metal 110, the below of the first piezoelectric patches 121 makes insulation system 130, and the mode adopted here can be identical with the mode of making the first piezoelectric patches 121; Finally, the latter half of the second surface of sheet metal 110 makes the second piezoelectric patches 122, and this mode adopted can be identical with the mode making the first piezoelectric patches 121.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skill in the art just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all those skilled in the art, all should by the determined protection range of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (10)
1. a piezo-activator, comprises first end and the second end; After described piezo-activator is applied in driving voltage, described the second end along first direction away from described first end; After described piezo-activator is cancelled described driving voltage, described the second end replys its initial position along direction opposite to the first direction; It is characterized in that, comprise the first piezoelectric patches and second piezoelectric patches of strip, described first piezoelectric patches and described second piezoelectric patches are connected and extend in the shape of a spiral insulated from each otherly, and the direction that described first piezoelectric patches points to described second piezoelectric patches is parallel to described first direction.
2. piezo-activator as claimed in claim 1, wherein said first piezoelectric patches and described second piezoelectric patches extend along circular helix, and the rotating shaft of described circular helix is along described first direction.
3. piezo-activator as claimed in claim 2, the first surface of wherein said first piezoelectric patches towards the rotating shaft of described circular helix, the rotating shaft of the second surface of described first piezoelectric patches described circular helix dorsad; The first surface of described second piezoelectric patches towards the rotating shaft of described circular helix, the rotating shaft of the second surface of described second piezoelectric patches described circular helix dorsad; The first surface of described first piezoelectric patches and the first surface ground connection of described second piezoelectric patches, the second surface of described first piezoelectric patches has the first electrode, the second surface of described second piezoelectric patches has the second electrode.
4. piezo-activator as claimed in claim 3, the polarised direction of wherein said first piezoelectric patches is the normal direction of the first surface along described first piezoelectric patches, the polarised direction of described second piezoelectric patches is along the 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.
5. piezo-activator as claimed in claim 3, the polarised direction of wherein said first piezoelectric patches is the normal direction of the first surface along described first piezoelectric patches, the polarised direction of described second piezoelectric patches is the normal direction of the first surface along described second piezoelectric patches, described first electrode is positive pole, and described second electrode is negative pole.
6. the piezo-activator as described in claim 4 or 5, one end of wherein said first piezoelectric patches and one end of described second piezoelectric patches form described first end, and the other end of described first piezoelectric patches and the other end of described second piezoelectric patches form described the second end.
7. the piezo-activator as described in claim 4 or 5, wherein also comprise the sheet metal of strip, the first surface of described sheet metal is towards the rotating shaft of described circular helix, the rotating shaft of the second surface of described sheet metal described circular helix dorsad, the second surface of described sheet metal engages with the first surface of the first surface of described first piezoelectric patches and described second piezoelectric patches, described sheet metal ground connection.
8. piezo-activator as claimed in claim 7, one end of wherein said first piezoelectric patches, one end of described second piezoelectric patches and one end of described sheet metal form described first end, and the other end of described first piezoelectric patches, the other end of described second piezoelectric patches and the other end of described sheet metal form described the second end.
9. a Braille display, by the piezoelectric actuator constructions described in any preceding Claim, it is characterized in that, comprise a word array, each braille in described some word array comprises panel, described panel has multiple hole, a described piezo-activator is furnished with in the corresponding each described hole of described lower panels, the described first end of described piezo-activator is 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 cancelled described driving voltage, described lower panels is got back to from described hole in described contact.
10. Braille display as claimed in claim 9, wherein said multiple hole is arranged into the array that 3 row 2 arrange.
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| CN201410664275.5A CN104638973B (en) | 2014-11-19 | 2014-11-19 | Piezoelectric actuator and Braille display structured thereby |
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| CN201410664275.5A CN104638973B (en) | 2014-11-19 | 2014-11-19 | Piezoelectric actuator and Braille display structured thereby |
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| CN104638973A true CN104638973A (en) | 2015-05-20 |
| CN104638973B CN104638973B (en) | 2017-02-22 |
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Cited By (3)
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| 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 |
| CN111932992A (en) * | 2020-08-26 | 2020-11-13 | 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 |
Families Citing this family (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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| 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 |
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