CN111752408A

CN111752408A - Tactile display device

Info

Publication number: CN111752408A
Application number: CN202010496757.XA
Authority: CN
Inventors: 焦阳; 徐迎庆; 贾艳红; 张锦文; 高家思
Original assignee: Tsinghua University
Current assignee: Zhongqing Intelligent Equipment Kunshan Co ltd
Priority date: 2020-06-03
Filing date: 2020-06-03
Publication date: 2020-10-09
Anticipated expiration: 2040-06-03
Also published as: CN111752408B

Abstract

The invention relates to the technical field of blind touch display, in particular to a touch display device which comprises a base, a contact and a driving structure arranged corresponding to the contact, wherein the driving structure is arranged on the base and comprises a driving piece and an eccentric wheel, the outer circumferential surface of the eccentric wheel is in contact with the contact, and the driving piece can drive the eccentric wheel to rotate so as to drive the contact to reciprocate along a straight line. The driving piece drives the eccentric wheel to rotate around the rotation center, and the contact point reciprocates linearly in the direction perpendicular to the axis of the eccentric wheel during the rotation of the eccentric wheel, so that the contact point rises and falls in a reciprocating manner. When a plurality of contacts are arranged on the base, the distance between the contacts can be adjusted to display the traditional braille, and the large-breadth display can also form graphic display to become a display for the blind. The eccentric wheel rotating structure controls the rise and fall of the contact, the structure is simpler and more compact, and the addition of the mechanical structure enables the control process to save more electricity.

Description

Tactile display device

Technical Field

The invention relates to the technical field of blind person touch display, in particular to a touch display device.

Background

The touch reading and watching speed is high, the identification degree is high, and the method is the most important reading and watching mode for the blind. However, the conventional braille books are expensive, complicated in manufacturing process and long in time consumption, the published braille books are few, single in variety, lag in information, small in information amount, heavy in size and inconvenient to carry, braille painting does not have a better form to be represented, and the conventional braille works can not meet the requirements of the blind people far. The existing touch display device is large in size and heavy, electronic elements are mostly adopted in the touch display device, the touch display device is high in price and large in power consumption, and the touch display device is difficult to widely popularize and apply.

Disclosure of Invention

Technical problem to be solved

The invention aims to solve the technical problems that electronic elements are mostly adopted in the existing touch display device, the price is high, the power consumption is high, and the touch display device is difficult to widely popularize and apply.

(II) technical scheme

In order to solve the technical problem, the invention provides a touch display device, which comprises a base, a contact and a driving structure arranged corresponding to the contact, wherein the driving structure is arranged on the base and comprises a driving part and an eccentric wheel, the outer circumferential surface of the eccentric wheel is in contact with the contact, and the driving part can drive the eccentric wheel to rotate so as to drive the contact to reciprocate along a straight line.

The driving part comprises an electromagnet, a magnet is arranged on the eccentric wheel, two magnetic poles of the magnet are arranged along the radial direction of the eccentric wheel, and the two magnetic poles of the electromagnet are arranged along the axial direction perpendicular to the eccentric wheel.

And the two magnetic poles of the magnet are arranged along the radial direction of the farthest end and the nearest end of the eccentric wheel.

The eccentric wheel comprises a first eccentric part and two second eccentric parts, the two second eccentric parts are respectively arranged at two ends of the first eccentric part along the axial direction of the eccentric wheel, and the magnet is arranged in the first eccentric part.

Wherein a cross-sectional area of the first eccentric portion is smaller than a cross-sectional area of the second eccentric portion.

The base is provided with a groove, the groove corresponds to the contacts one to one, and the driving structure is arranged in the groove.

The eccentric wheel is provided with rotating shafts at two axial ends, the rotating shafts are located at the center of a circle of a base circle of the eccentric wheel, and the side wall of the groove is provided with connecting parts which are connected with the rotating shafts.

Wherein, still include the lid, the lid establish with on the base, just be equipped with the mounting hole on the lid, the mounting hole with the contact corresponds the setting, the bottom surface of lid is constructed with first joint portion, the top surface of base is constructed with second joint portion, first joint portion with second joint portion is to the complex ladder face.

The step descending directions of the two second clamping parts between two adjacent grooves are opposite.

The number of the contacts is multiple, and the contacts are arranged in a 4 x 4 array.

(III) advantageous effects

The technical scheme of the invention has the following advantages: according to the touch display device provided by the embodiment of the invention, the driving piece drives the eccentric wheel to rotate around the rotation center, the outer circumferential surface of the eccentric wheel keeps contact with the contact at any time in the rotation process, the contact reciprocates in a straight line in the direction vertical to the axis of the eccentric wheel in the rotation process of the eccentric wheel, namely when the eccentric wheel rotates to the outer circumferential surface at the farthest end to be contacted with the contact, the contact is jacked to the highest position, and when the outer circumferential surface at the nearest end of the eccentric wheel rotates to be contacted with the contact, the contact falls to the lowest position, so that the contact is lifted and descended in a reciprocating manner. When a plurality of contacts are arranged on the base, the distance between the contacts can be adjusted to display the traditional braille, and the large-breadth display can also form graphic display to become a display for the blind. The eccentric wheel rotating structure controls the rise and fall of the contact, the structure is simpler and more compact, and the addition of the mechanical structure enables the control process to save more electricity.

In addition to the technical problems addressed by the present invention, the technical features constituting the technical solutions and the advantages brought by the technical features of the technical solutions described above, other technical features of the present invention and the advantages brought by the technical features of the technical solutions will be further explained with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic diagram of a haptic display device according to an embodiment of the invention;

FIG. 2 is a schematic diagram of a split configuration of a base, contacts and drive structure of a tactile display device according to an embodiment of the invention;

FIG. 3 is a schematic view of a cover of a tactile display device according to an embodiment of the invention;

FIG. 4 is a schematic view of an eccentric wheel of the tactile display device according to the embodiment of the present invention;

FIG. 5 is a schematic diagram of the operation of a tactile display device according to an embodiment of the invention.

In the figure: 1: a base; 2: a contact; 3: a drive structure; 5: a cover body; 11: a groove; 12: a second clamping part; 31: a drive member; 32: an eccentric wheel; 33: a magnet; 51: mounting holes; 52: a first clamping part; 111: a connecting portion; 311: an electromagnet; 321: a first eccentric portion; 322: a second eccentric portion; 323: a rotating shaft.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, in the description of the present invention, unless otherwise specified, "plurality", "plural groups" means two or more, and "several", "several groups" means one or more.

As shown in fig. 1 and 2, the tactile display device according to the embodiment of the invention includes a base 1, a contact 2, and a driving structure 3 disposed corresponding to the contact 2, wherein the driving structure 3 is disposed on the base 1, the driving structure 3 includes a driving member 31 and an eccentric 32, an outer circumferential surface of the eccentric 32 contacts with the contact 2, and the driving member 31 can drive the eccentric 32 to rotate so as to drive the contact 2 to reciprocate linearly.

In the tactile display device of the embodiment of the invention, the driving part 31 drives the eccentric wheel 32 to rotate around the rotation center, the outer circumferential surface of the eccentric wheel 32 keeps contact with the contact 2 at any time in the rotating process, the contact 2 reciprocates in a straight line in the direction vertical to the axis of the eccentric wheel 32 in the rotating process of the eccentric wheel 32, namely when the eccentric wheel 32 rotates to the outermost outer circumferential surface to be contacted with the contact 2, the contact 2 is jacked to the highest position, and when the eccentric wheel 32 rotates to the nearest outer circumferential surface to be contacted with the contact 2, the contact 2 falls to the lowest position, so that the contact 2 can reciprocate. When the base 1 is provided with the plurality of contacts 2, the distance between the contacts 2 can be adjusted to display the traditional braille, and the display of the invention can be used in a large breadth, and can also form graphic display to become a display for the blind. The eccentric wheel 32 rotates to control the rising and falling of the contact 2, the structure is simpler and more compact, and the addition of a mechanical structure enables the control process to save more electricity.

In this embodiment, the farthest end of the eccentric wheel 32 is the position farthest from the rotation center, the nearest end of the eccentric wheel 32 is the position closest to the rotation center, the rotation center of the eccentric wheel 32 is the center of the base circle of the eccentric wheel 32, and the eccentricity is 0.25 mm.

As shown in fig. 2, 4 and 5, the driving member 31 includes an electromagnet 311, the eccentric wheel 32 is provided with a magnet 33, two magnetic poles of the magnet 33 are arranged along a radial direction of the eccentric wheel 32, and two magnetic poles of the electromagnet 311 are arranged along an axial direction perpendicular to the eccentric wheel 32. In this embodiment, the electromagnet 311 of the driving member 31 is energized to generate magnetic poles of N and S poles, the magnet 33 disposed on the eccentric wheel 32 has magnetic poles of N and S poles, after the electromagnet 311 is energized, currents in different directions can generate magnetic fields in different directions, and the magnet 33 on the eccentric wheel 32 is acted by a magnetic force, that is, the magnetic poles of the electromagnet 311 disposed perpendicular to the axial direction of the eccentric wheel 32 generate an acting force on the magnetic poles disposed on the magnet 33 along the radial direction of the eccentric wheel 32, and the acting force drives the magnet 33 to rotate, thereby driving the eccentric wheel 32 to rotate. By controlling the current passing through the electromagnet 311 under each contact 2, the position of the contact 2 at the moment can be controlled, so that the purpose of displaying touchable patterns or braille is achieved. Because the power is cut off immediately after each power-on writing, the eccentric wheel 32 is kept still at the power-off changing position, the contact 2 can also be kept in a stable state, and compared with a structure needing power-on keeping, the electromagnetic driving structure 3 is more power-saving in matching with the eccentric wheel 32 to rotate.

In this embodiment, the electromagnet 311 is an electromagnet and is composed of an iron core, a circuit board base 1, and an electromagnetic coil. The iron core is used for enhancing the magnetic force of the electromagnet after being electrified. The magnet 33 is a cylindrical permanent magnet having a diameter of 1mm and a height of 0.8 mm.

Wherein, as shown in fig. 5, two magnetic poles of the magnet 33 are arranged along the radial direction of the farthest end and the nearest end of the eccentric wheel 32. In this embodiment, the line of the farthest end and the nearest end of the eccentric wheel 32 is not in the same line with the axis of the electromagnet 311, so as to generate a force on the magnet 33 after the electromagnet 311 is energized, and generate a rotation torque when the eccentric wheel 32 is driven to rotate.

When the electromagnet 311 is not electrified, the eccentric wheel 32 is naturally in a low stable state due to the action of gravity, and the N level of the magnet 33 is just below the S pole;

the electromagnet 311 is electrified with reverse current, the N pole of the electromagnet 311 is arranged right below the S pole, and the eccentric wheel 32 needs to be slightly inclined to achieve stress balance;

the electromagnet 311 is electrified with positive current, the N pole of the electromagnet 311 is right above the S pole, the eccentric wheel 32 needs to ensure that the N level of the magnet 33 faces upwards, and starts to rotate towards a side wall of the base 1 far away from the rotation center and jacks up the contact 2;

at this point, the current is immediately cut off, and the eccentric 32 continues to rotate under the inertia until it hits the limit position of a side wall of the base 1 near the center of rotation. At this time, the magnet 33 on the eccentric 32 provides gravity (the contact 2 is smaller than the magnet 33 than the gravity of the eccentric 32 itself), and the center of gravity of the entire structure is left of the rotation center of the eccentric 32. Therefore, the gravity and the rotation center generate a downward-pressing moment, the downward-pressing moment is balanced with the friction force provided by the side wall of the base 1, and the contact 2 reaches a high stable state;

the electromagnet 311 is electrified with reverse current, the N pole of the electromagnet 311 is right below the S pole, and after the electromagnet is immediately powered off, the eccentric wheel 32 can return to a low steady state through reverse rotation.

As shown in fig. 4, the eccentric wheel 32 includes a first eccentric portion 321 and two second eccentric portions 322, the two second eccentric portions 322 are respectively disposed at two ends of the first eccentric portion 321 along the axial direction of the eccentric wheel 32, and the magnet 33 is disposed in the first eccentric portion 321. In this embodiment, the eccentric wheel 32 is a cylindrical whole, the first eccentric portion 321 is a cylindrical part, a through hole is formed in the middle, the magnet 33 is installed in the through hole, the second eccentric portions 322 are respectively disposed at two ends of the first eccentric portion 321 in the axial direction, and the second eccentric portions 322 are disc-shaped parts having a certain thickness.

Wherein the cross-sectional area of the first eccentric portion 321 is smaller than the cross-sectional area of the second eccentric portion 322. In this embodiment, the first eccentric portion 321 of the middle fixed magnet 33 of the eccentric wheel 32 is slightly thinner than the second eccentric portion 322 of the outer circumferential surface contacting the contact 2, so that the first eccentric portion 321 in the middle does not contact the contact 2, and the friction area between the eccentric wheel 32 and the contact 2 is reduced; secondly, in order to reduce the weight of the whole eccentric wheel 32, the required driving force is reduced.

As shown in fig. 2, the base 1 is provided with grooves 11, the grooves 11 correspond to the contacts 2 one by one, and the driving structure 3 is disposed in the grooves 11. Set up recess 11 on the base 1, each recess 11 holds a drive structure 3, and contact 2 is located the notch top of recess 11 all the time, keeps away from or is close to recess 11 under drive structure 3's drive. In this embodiment, the groove 11 is divided into two layers, the bottom layer is a cylindrical cavity for fixing the electromagnet 311, and the top layer is a square cavity for accommodating the eccentric wheel 32. The core of the electromagnet 311 protrudes from the bottom cavity into the top cavity so as to be adjacent to the magnet 33 of the eccentric 32.

Wherein, the eccentric wheel 32 is provided with a rotating shaft 323 at two axial ends thereof, the rotating shaft 323 is positioned at the center of the base circle of the eccentric wheel 32, the side wall of the groove 11 is provided with a connecting part 111, and the connecting part 111 is connected with the rotating shaft 323. In the present embodiment, the rotation shaft 323 is located at the rotation center of the eccentric wheel 32, that is, a thin cylinder is provided as the rotation shaft 323 on the surface of the two second eccentric portions 322 of the eccentric wheel 32, the rotation shaft 323 can be used to support and fix the eccentric wheel 32 in the groove 11, the two opposite side walls of the groove 11 are each provided with the connecting portion 111 at the position corresponding to the rotation shaft 323, the connecting portion 111 can be a hole, and the rotation shaft 323 is inserted into the hole and rotates in the hole. In order to facilitate the installation of the eccentric wheel 32 and the manufacture of the base 1, the connecting portion 111 may also be a strip-shaped notch formed from the edge of the notch of the groove 11 to the bottom of the groove 11, the eccentric wheel 32 directly falls from the notch, the rotating shaft 323 enters the notch, which is equivalent to being erected in the groove 11, and the rotating shaft 323 rotates in the notch.

As shown in fig. 2 and fig. 3, the tactile display device according to the embodiment of the invention further includes a cover 5, the cover 5 covers the base 1, the cover 5 is provided with a mounting hole 51, the mounting hole 51 is disposed corresponding to the contact 2, a bottom surface of the cover 5 is configured with a first clamping portion 52, a top surface of the base 1 is configured with a second clamping portion 12, and the first clamping portion 52 and the second clamping portion 12 are stepped surfaces which are engaged with each other. The cover 5 is provided with a mounting hole 51, when the cover 5 is to be disposed on the base 1, after the driving structure 3 retracts the contact 2, the surface of the contact 2 is flush with the surface of the cover 5, and when the driving structure 3 pushes up the contact 2, the contact 2 can be protruded from the corresponding mounting hole 51. The bottom surface of lid 5 is connected with the top surface of base 1, and the junction sets up first joint portion 52 and the cooperation of second joint portion 12, and in this embodiment, first joint portion 52 is the ladder face with second joint portion 12, and two ladder faces are involutive each other and are realized spacing connection. In this embodiment, the transition surface between the convex surface and the concave surface of the stepped surface is designed to be an inclined surface, so that the upper and lower stepped surfaces can smoothly slide and align when the cover body 5 is assembled with the base 1.

Wherein, the step descending directions of the two second clamping parts 12 between the two adjacent grooves 11 are opposite. When a plurality of grooves 11 are arranged on the base 1, the notches of each groove 11 are respectively provided with a second clamping portion 12, in this embodiment, the top surfaces of the two opposite side walls of each groove 11 are stepped surfaces, and the descending directions of the stepped surfaces between the adjacent grooves 11 are arranged in a staggered manner. All there is double-deck lateral wall between two adjacent recesses 11, and the top cap is accomplished the back with base 1 installation, and the area of contact of ladder face about the increase can provide bigger friction, realizes the spacing of horizontal direction, guarantees that the installation is firm, and improves the structural strength of recess 11 lateral walls.

In this embodiment, the length of the convex surface of the step surface of the second engaging portion 12 is half of the length of the top surface of one side wall of the groove 11, and the step surface of the first engaging portion 52 is engaged therewith.

As shown in fig. 1 and 2, the number of the contacts 2 is plural, and the plural contacts 2 are arranged in a 4 × 4 array. In this embodiment, the contacts 2 are arranged in an array on the base 1, the driving structure 3 is arranged in the same array as the contacts 2 corresponding to the groove 11, and the 4 × 4 rectangular array includes 16 contacts 2. In the embodiment, the length and the width of the base 1 are both 1cm, the height is 5.2mm, the distance between the adjacent contacts 2 is 2.5mm, the distance is the distance between universal braille points, two braille characters can be displayed by a 4 x 4 dot matrix, and the braille characters can be conveniently used in actual products. Because the size of the touch display device is very small, the invention concentrates the matrix arrangement of the contacts 2 on one base 1, and avoids the problem that each contact 2 is independently provided with a shell, the wall thickness of the shell is 0.25mm, and the processing is easy to deform. The convex surface length of the ladder face of second joint portion 12 is 1.25mm, and the inclination of the transition face between convex surface and the concave surface is 45, and the convex surface height is 0.45 mm.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A tactile display device, characterized by: including base, contact and with the drive structure that the contact corresponds the setting, drive structure set up in on the base, drive structure includes driving piece and eccentric wheel, the outer periphery of eccentric wheel with the contact, the driving piece can drive the eccentric wheel rotates, in order to drive the contact is along sharp reciprocating motion.

2. A tactile display device according to claim 1, wherein: the driving part comprises an electromagnet, a magnet is arranged on the eccentric wheel, two magnetic poles of the magnet are arranged along the radial direction of the eccentric wheel, and the two magnetic poles of the electromagnet are arranged along the axial direction perpendicular to the eccentric wheel.

3. A tactile display device according to claim 2, wherein: two magnetic poles of the magnet are arranged along the radial direction of the farthest end and the nearest end of the eccentric wheel.

4. A tactile display device according to claim 2, wherein: the eccentric wheel comprises a first eccentric part and two second eccentric parts, wherein the two second eccentric parts are arranged at two ends of the first eccentric part respectively along the axial direction of the eccentric wheel, and the magnet is arranged in the first eccentric part.

5. A tactile display device according to claim 4, wherein: the cross-sectional area of the first eccentric portion is smaller than the cross-sectional area of the second eccentric portion.

6. A tactile display device according to claim 1, wherein: the base is provided with grooves, the grooves correspond to the contacts one to one, and the driving structure is arranged in the grooves.

7. A tactile display device according to claim 6, wherein: the eccentric wheel is provided with rotating shafts at two axial ends, the rotating shafts are located at the center of a circle of a base circle of the eccentric wheel, and the side wall of the groove is provided with a connecting part which is connected with the rotating shafts.

8. A tactile display device according to claim 6, wherein: still include the lid, the lid establish with on the base, just be equipped with the mounting hole on the lid, the mounting hole with the contact corresponds the setting, the bottom surface of lid is constructed with first joint portion, the top surface of base is constructed with second joint portion, first joint portion with second joint portion is to the complex ladder face.

9. A tactile display device according to claim 8, wherein: the step descending directions of the two second clamping parts between the two adjacent grooves are opposite.

10. A tactile display device according to any one of claims 1 to 9, wherein: the contact is a plurality of, a plurality of contact is 4 x 4 array arrangement.