Braille point display

Abstract

The invention discloses a braille point display device. According to the Braille point display, the shape memory alloy material is used as the lifting structure, and the lifting structure is controlled to deform under the power-on condition, so that the point display part is driven to extend or retract relative to the mounting main body. Compared with piezoelectric driving and electromagnetic driving equipment, the shape memory alloy material can adjust the deformation quantity through the power-on state, large deformation quantity can be generated through a small structural material, the size of a lifting structure does not need to be increased, the driving structure of the braille convex points is effectively simplified, the size of the equipment is reduced, and the production cost of the equipment is reduced. And meanwhile, the locking mechanism is arranged, so that the telescopic state of the point display part is kept, the situation that the lifting structure is always kept in a power-on state is avoided, and the power consumption of equipment is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of blind education equipment, and in particular to a Braille display. Background Art

[0002] A braille display is an electromechanical assistive device designed for the visually impaired. A braille display displays braille characters by protruding different dots on a flat surface. Each braille character consists of raised dots and recessed spaces, which can be felt and read by the visually impaired through touch. This device can convert electronic text into braille dots, allowing blind users who cannot use general display devices to feel the text through touch.

[0003] At present, the mechanical principles used by Braille displays to highlight dots are mainly piezoelectric drive and electromagnetic drive.

[0004] Piezoelectric-driven Braille displays are generally made of piezoelectric ceramic materials in the form of long strips, with the tail end being a wire connection port and the front end being placed directly below the Braille dots. When power is applied, the piezoelectric ceramic material deforms, and since the tail end is fixed and performs the conductive function, only the front end is displaced, causing the entire piezoelectric ceramic material to bend upward in an arc, lifting the Braille dots and thus forming Braille characters. In order to produce sufficient deformation of the piezoelectric ceramic material, this driving method requires the piezoelectric ceramic material to be designed to be relatively long, resulting in the size of the Braille display being too large, and the process of lifting the Braille dots requires continuous power supply, resulting in high power consumption. In addition, the cost of piezoelectric ceramic materials is relatively high, and piezoelectric materials usually require high voltage drive, so the price of piezoelectric ceramic modules is high.

[0005] Electromagnetic-driven Braille displays work on the principle of electromagnetics, that is, when the magnetic field generated by the current passing through the wire interacts with the ferromagnetic material, it will generate an attractive or repulsive force, which can drive the Braille dots to rise or fall to form Braille characters. This driving method requires the installation of electromagnetic components, which are relatively large in size and cannot reduce the size of the Braille display. In addition, they need to be powered on continuously to display Braille characters, which consumes a lot of power and is prone to electromagnetic interference, affecting the display accuracy and stability of Braille characters. In addition, electromagnetic-driven Braille displays have many parts, a relatively complex structure, and high production process requirements, so the manufacturing cost is also relatively high.

[0006] In summary, current Braille displays have the problems of large size, high power consumption and high cost. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a Braille dot display device which can simplify the driving structure of the Braille dots, reduce the device size, reduce the device power consumption, and reduce the device cost.

[0008] In order to solve the above technical problems, a technical solution adopted by the present invention is: A braille display device comprises a plurality of braille display modules, each of which comprises a plurality of braille display mechanisms and locking mechanisms arranged in a mounting body, wherein a slide rail space is arranged in the mounting body; Each of the point display mechanisms comprises a point display component and a lifting structure, wherein the point display component is arranged in the slide rail space and abuts against the lifting structure; The lifting structure is made of shape memory alloy material, and is connected to a power source. When powered on, the lifting structure deforms, so that the point display element extends or retracts relative to the installation body. The locking mechanism is used to limit the lifting and lowering displacement of the point indicator so that the point indicator maintains the extended or retracted state.

[0009] The beneficial effects of the present invention are as follows: shape memory alloy material is a metal material that can change its shape by changing its temperature through power supply. The shape memory alloy material is used as a lifting structure. When power is supplied, the lifting structure is controlled to deform, thereby driving the point display component to extend or retract relative to the installation body. Compared with piezoelectric driven and electromagnetic driven devices, shape memory alloy materials can adjust the deformation amount by the power supply state, and can produce a larger deformation amount with a smaller structural material, without increasing the volume of the lifting structure, effectively simplifying the driving structure of the Braille convex point, reducing the volume of the equipment, and reducing the production cost of the equipment. The current required for the shape memory alloy material to deform when power is supplied is small and the deformation amount is large. At the same time, a locking mechanism is provided to maintain the telescopic state of the point display component, prevent the lifting structure from being always powered on, and reduce the power consumption of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 An overall schematic diagram of a dot display module provided by an embodiment of the present invention; Figure 2 A cross-sectional view of a dot display module along line AA provided by an embodiment of the present invention; Figure 3 A schematic diagram of the overall structure of a dot display module provided by an embodiment of the present invention; Figure 4 A structural schematic diagram of a locking mechanism provided by an embodiment of the present invention; Figure 5 A cross-sectional schematic diagram of a locking mechanism provided by an embodiment of the present invention when unlocking; Figure 6 A cross-sectional schematic diagram of a locking mechanism provided by an embodiment of the present invention when locked; Figure 7 A structural schematic diagram of a lifting structure provided by an embodiment of the present invention; Figure 8 A schematic diagram of the structure of a metal spring provided in an embodiment of the present invention; Fig. 9 A schematic diagram of a lifting drive of a lifting structure provided by an embodiment of the present invention; Fig.10 A schematic diagram of a descending drive of a lifting structure provided by an embodiment of the present invention; Fig.11 A schematic diagram of an arrangement of a dot display module provided by an embodiment of the present invention; Fig.12 A schematic diagram of the structure of a linear lifting drive line provided by an embodiment of the present invention; Fig.13 A schematic structural diagram of a U-shaped lifting drive line provided in an embodiment of the present invention; Fig.14 A schematic structural diagram of another U-shaped lifting drive line provided in an embodiment of the present invention; Fig.15 A schematic structural diagram of another U-shaped lifting drive line provided in an embodiment of the present invention; Fig.16 A schematic diagram of the deformation amount provided by an embodiment of the present invention; Fig.17 A structural schematic diagram of a locking drive assembly provided by an embodiment of the present invention; Fig.18 A schematic diagram of another locking drive assembly provided in an embodiment of the present invention Fig.19 A schematic diagram of the structure of an installation body provided by an embodiment of the present invention; Fig. 20 A schematic diagram of the structure of an elastic telescopic member provided in an embodiment of the present invention; Fig.21 for Fig. 20 A bottom view of an elastic telescopic member in; Fig. 22 A schematic diagram of the structure of another elastic telescopic member provided in an embodiment of the present invention; Fig.23 A schematic diagram of the structure of another elastic telescopic member provided in an embodiment of the present invention; Fig.24 A schematic structural diagram of another locking drive assembly provided by an embodiment of the present invention; Fig.25 A schematic structural diagram of another elastic telescopic member provided in an embodiment of the present invention; Description of labels: 1. Point display module; 11. Installation body; 111. Slide rail space; 112. Accommodation space; 113. Telescopic hole; 114. Groove; 12. Point display mechanism; 121. Point display member; 122. Lifting structure; 1211. Protruding portion; 1221. Lifting drive line; 1222. Metal spring; 221. Fixing portion; 222. Elastic portion; 223. Bending portion; 224. Platform portion; 225. Extending portion; 226. Nailing pile; 13. Locking mechanism; 131. Locking movable plate; 132. Locking driving assembly; 1311. Through hole; 1321. First metal wire; 1322. Second metal wire; 1312. Anchor block; 1323. Elastic telescopic member; 321. Connecting portion; 3211. Hollow area; 322. Serpentine spring; 323. First serpentine spring; 324. Second serpentine spring. DETAILED DESCRIPTION

[0011] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0012] An embodiment of the present invention provides a braille display device, comprising a plurality of braille display modules, each of which comprises a plurality of braille display mechanisms and locking mechanisms disposed in a mounting body, wherein a slide rail space is disposed in the mounting body; Each of the point display mechanisms comprises a point display component, a lifting drive line and a metal spring sheet, wherein the point display component is arranged in the slide rail space and abuts against the elastic end of the metal spring sheet; Each of the point display mechanisms comprises a point display component and a lifting structure, wherein the point display component is arranged in the slide rail space and abuts against the lifting structure; The lifting structure is made of shape memory alloy material, and is connected to a power source. When powered on, the lifting structure deforms, so that the point display element extends or retracts relative to the installation body. The locking mechanism is used to limit the lifting and lowering displacement of the point indicator so that the point indicator maintains the extended or retracted state.

[0013] From the above description, it can be seen that the beneficial effects of the present invention are: shape memory alloy material is a metal material that can change its shape by changing its temperature through power. The shape memory alloy material is used as a lifting structure. When the power is on, the lifting structure is controlled to deform, thereby driving the point display component to extend or retract relative to the installation body. Compared with piezoelectric driven and electromagnetic driven devices, shape memory alloy materials can adjust the deformation amount by the power-on state, and can produce a larger deformation amount with a smaller structural material, without increasing the volume of the lifting structure, effectively simplifying the driving structure of the Braille convex point, reducing the volume of the equipment, and reducing the production cost of the equipment. The current required for the shape memory alloy material to deform when it is powered on is small and the deformation amount is large. At the same time, a locking mechanism is provided to maintain the telescopic state of the point display component, prevent the lifting structure from being always powered on, and reduce the power consumption of the equipment.

[0014] Further, the locking mechanism includes a locking movable plate and a locking drive assembly; The locking movable plate is movably arranged on the mounting body; The locking movable plate is provided with a through hole opposite to the point display component, the point display component is provided with a convex portion, and the shape and size of the through hole match the convex portion; The locking drive assembly is used to drive the locking movable plate to move on the mounting body so that the through hole is misaligned or aligned with the protruding portion.

[0015] It can be seen from the above description that when the point display component needs to be lifted or lowered, the locking movable plate is driven to move so that the through hole on the locking movable plate is aligned with the raised portion on the point display component, so that the point display component can extend from the through hole to realize the dot matrix protrusion, thereby cooperating with the retracted point display component to realize the display of Braille characters. Among them, after the point display component completes the lifting position adjustment, the locking movable plate is driven to move so that the through hole on the locking movable plate is misaligned with the raised portion on the point display component, thereby engaging the point display component on the locking movable plate, maintaining the current position state of the point display component, realizing the locking function, preventing the point display component from floating up and down, and effectively improving the stability of the lifting position of the point display component. In addition, since the point display component is provided with a locking structure to maintain the position state, the lifting drive line does not need to be continuously powered on to maintain the lifting state, thereby reducing the power consumption of the equipment.

[0016] Furthermore, the lifting structure includes a lifting drive line and a metal spring; The lifting drive line is made of shape memory alloy material and is connected to a power source; The elastic end of the metal spring is in contact with the point display element; The fixed end of the metal spring away from the point display element is fixed to the installation body, the first end of the lifting drive line is fixed to the installation body, and the second end of the lifting drive line is connected to the elastic end of the metal spring; The straight line where the lifting drive line is located and the plane where the metal spring sheet is located are parallel to or perpendicular to each other.

[0017] From the above description, it can be seen that the shape memory alloy material is used as the lifting drive wire. When the power is on, the lifting drive wire is controlled to deform, thereby driving the metal spring to deform accordingly, and then driving the dot display component to extend or retract relative to the installation body. Among them, the lifting drive adopts a wire structure, which effectively reduces the overall volume of the lifting structure. At the same time, the deformation of the lifting drive wire is further amplified by the metal spring to improve the accuracy of the Braille character display.

[0018] Furthermore, the metal spring sheet includes a fixing portion, an elastic portion, a bending portion and a platform portion; One end of the fixing portion is fixed to the mounting body, and the other end of the fixing portion is connected to one end of the elastic portion; The other end of the elastic part is connected to one end of the bent part, and the other end of the bent part is connected to the platform part, so that a step shape is formed between the elastic part and the platform part. The point display element is in contact with the platform portion.

[0019] It can be seen from the above description that the elastic part of the metal shrapnel is used to provide elastic deformation to ensure that the platform part can produce sufficient deformation, and the platform part of the metal shrapnel is used to set the point display part to ensure that the point display part can deform synchronously with the metal shrapnel. A step is formed between the elastic part and the platform part, so that the stress generated by the stretching of the lifting drive line on the metal shrapnel can be more evenly distributed on the entire shrapnel, which helps to reduce local stress concentration and improve the overall bearing capacity of the shrapnel. By pulling the metal shrapnel, the smaller deformation generated after the lifting drive line is energized is amplified into a larger deformation of the metal shrapnel, thereby generating a larger deformation without increasing the volume of the lifting drive line, effectively reducing the volume of the equipment.

[0020] Furthermore, the straight line where the lifting drive line is located is parallel to the plane where the metal spring is located, the first end of the lifting drive line is fixed to a side of the installation body close to the fixing part, and the second end of the lifting drive line is connected to the platform part.

[0021] From the above description, it can be seen that when the lifting drive line and the metal spring are parallel to each other, one end of the lifting drive line is fixed to the side of the installation body close to the fixed part, and the other end of the lifting drive line is connected to the platform part, so that when the lifting drive line is energized and deformed, it can directly drive the platform part of the metal spring to deform, thereby improving the lifting effect of the point display component, and the installation structure is simple and convenient, reducing the vertical space occupied.

[0022] Furthermore, the straight line where the lifting drive line is located is perpendicular to the plane where the metal spring is located, the first end of the lifting drive line is fixed to the area opposite to the installation body and the elastic part, and the second end of the lifting drive line is connected to the elastic part.

[0023] From the above description, it can be seen that when the lifting drive line and the metal spring are perpendicular to each other, one end of the lifting drive line is fixed to the area opposite to the installation body and the elastic part, and the other end of the lifting drive line is connected to the elastic part, so that when the lifting drive line is energized and deformed, it can indirectly drive the platform part of the metal spring to have a larger deformation amount with a smaller deformation amount, thereby improving the lifting effect of the point display component.

[0024] Further, the locking drive assembly includes a first metal wire and a second metal wire; The first metal wire and the second metal wire are both made of shape memory alloy material; The head end and the tail end of the first metal wire are respectively fixed to the two ends of the first side of the installation body, and the middle part of the first metal wire is fixed to the locking movable plate; The head end and the tail end of the second metal wire are respectively fixed to the two ends of the second side of the installation body, and the middle part of the second metal wire is fixed to the locking movable plate; The first side is opposite to the second side.

[0025] From the above description, it can be seen that the first metal wire and the second metal wire are respectively arranged on both sides of the locking movable plate. When power is turned on, the first metal wire and the second metal wire are controlled to deform respectively, and the locking movable plate is driven to move by the different deformation amounts generated by the first metal wire and the second metal wire.

[0026] Further, the locking drive assembly includes a first metal wire and an elastic telescopic member; The first metal wire is made of shape memory alloy material; One end of the first metal wire is fixed to the first side of the mounting body, and the other end of the first metal wire is fixed to the locking movable plate; One end of the elastic telescopic member is fixed to the second side of the mounting body, and the other end of the elastic telescopic member is fixed to the locking movable plate; The first side is opposite to the second side.

[0027] From the above description, it can be seen that a first metal wire is arranged on one side of the locking movable plate to drive the locking movable plate to move, and an elastic telescopic component is arranged on the other side to provide a restoring force for the locking movable plate, so that the first metal wire can directly realize the locking function through the elastic telescopic component when no power is supplied, thereby reducing the power consumption of the equipment.

[0028] Furthermore, the plane where the elastic telescopic member is located is parallel to the plane where the locking movable plate is located; The elastic expansion member comprises a connecting portion and a serpentine spring; The connecting portion is covered on the locking movable plate, and a hollow area opposite to the through hole is provided on the connecting portion; One end of the serpentine spring is fixed to the second side of the mounting body, and the other end of the serpentine spring is connected to the connecting portion.

[0029] It can be seen from the above description that when the elastic telescopic member is parallel to the locking movable plate, the connection portion covers the locking movable plate, thereby increasing the contact area between the elastic telescopic member and the locking movable plate, thereby improving the movement stability of the locking movable plate. The wave shape of the serpentine spring provides a good buffering effect. When the spring pulls the locking movable plate, the wave structure of the spring disperses the force between the waves, thereby reducing stress concentration and providing a more uniform support area.

[0030] Furthermore, the plane where the elastic telescopic member is located is perpendicular to the plane where the locking movable plate is located; The elastic telescopic member comprises a first serpentine spring and a second serpentine spring, wherein the first serpentine spring and the second serpentine spring are respectively arranged on a third side and a fourth side opposite to the mounting body; One end of the first serpentine spring is fixed to one end of the third side close to the second side, and the other end of the first serpentine spring is fixed to one end of the locking movable plate close to the third side; One end of the second serpentine spring is fixed to an end of the fourth side close to the second side, and the other end of the second serpentine spring is fixed to an end of the locking moving plate close to the fourth side.

[0031] From the above description, it can be seen that when the elastic telescopic part is parallel to the locking movable plate, the two serpentine springs are respectively arranged on both sides of the locking movable plate to ensure that the restoring force provided by the springs is balanced, thereby improving the stability of the locking movable plate. At the same time, the restoring force provided by the two spring locks is greater, which is suitable for scenarios where the locking movable plate is larger in size.

[0032] The above-mentioned braille dot display device of the present invention can simplify the driving structure of the braille convex dots, reduce the device volume, reduce the device power consumption, and reduce the device cost, which is described below through specific implementation methods: Please refer to Figures 1 to 11 , Embodiment 1 of the present invention is: like Figure 1 and Figure 2 As shown, a braille display device includes a plurality of display modules 1, each display module 1 includes a plurality of display mechanisms 12 and locking mechanisms 13 arranged in a mounting body 11, and a slide rail space 111 is arranged in the mounting body 11. The number of the slide rail spaces 111 corresponds to the number of the display mechanisms 12.

[0033] like Figure 2As shown, each point display mechanism 12 includes a point display component 121 and a lifting structure 122. The point display component 121 is arranged in the slide rail space 111 and abuts against the lifting structure 122. Only one point display component 121 is arranged in each slide rail space 111. The lifting structure 122 is made of shape memory alloy material. The lifting structure 122 is connected to a power source. After power is turned on, the lifting structure 122 deforms, so that the point display component 121 extends or retracts relative to the installation body 11. Among them, the installation body 11 is also provided with a receiving space 112. The lifting structure 122 is arranged in the receiving space 112, and the receiving space 112 is connected to the slide rail space 111. In addition, a plurality of telescopic holes 113 corresponding to the point display component 121 are arranged on the installation body 11. Each telescopic hole 113 is correspondingly provided with a point display component 121, and each telescopic hole 113 is respectively connected to a slide rail space 111. The locking mechanism 13 is used to limit the lifting and lowering displacement of the point indicator 121 so that the point indicator 121 remains in an extended or retracted state.

[0034] like Figure 3 and Figure 4 As shown, specifically, the locking mechanism 13 includes a locking movable plate 131 and a locking driving assembly 132. The locking movable plate 131 is movably arranged on the installation body 11. The locking movable plate 131 is provided with a through hole 1311 opposite to the point display member 121, and the point display member 121 is provided with a protrusion 1211, and the shape and size of the through hole 1311 match the protrusion 1211. The locking driving assembly 132 is used to drive the locking movable plate 131 to move on the installation body 11, so that the through hole 1311 is misaligned or aligned with the protrusion 1211. It should be noted that the locking movable plate 131 is provided with a plurality of through holes 1311 having the same number as all the point display elements 121, so that all the point display elements 121 can be unlocked and locked synchronously. For example, the locking movable plate 131 is provided with 8 through holes 1311, so that 8 point display elements 121 can be locked synchronously, or the locking movable plate 131 is provided with 6 through holes 1311, so that 6 point display elements 121 can be locked synchronously. In this embodiment, the cross-sectional shape of the protrusion 1211 on the point display element 121 is circular, so that the point display element 121 can rotate arbitrarily in a plane without affecting the locking effect.

[0035] In an optional embodiment, the cross-sectional shape of the protrusion 1211 on the point indicator 121 can also be set to a triangle, square, trapezoid, rhombus, regular pentagon, regular hexagon or semicircle. When the locking movable plate 131 has the same moving stroke, the misalignment degree between the through hole 1311 and the protrusion 1211 can be increased by changing the cross-sectional shape of the protrusion 1211, that is, the overlapping area between the locking movable plate 131 and the protrusion 1211 is increased, thereby improving the locking stability. Figure 5 As shown, the indicator 121 is in an unlocked state, and the through hole 1311 of the locking movable plate 131 is aligned with the protrusion 1211. Figure 6 As shown, the indicator 121 is in a locked state, and the through hole 1311 of the locking movable plate 131 is misaligned with the protrusion 1211 .

[0036] like Figure 7 As shown, specifically, the lifting structure 122 includes a lifting drive line 1221 and a metal spring 1222. The lifting drive line 1221 is made of shape memory alloy material and is connected to a power source. The elastic end of the metal spring 1222 abuts against the point display element 121. The fixed end B of the metal spring 1222 away from the point display element 121 is fixed to the installation body 11, the first end of the lifting drive line 1221 is fixed to the installation body 11, and the second end of the lifting drive line 1221 is connected to the elastic end A of the metal spring 1222. The straight line where the lifting drive line 1221 is located is parallel to or perpendicular to the plane where the metal spring 1222 is located. It should be noted that since the lifting drive line 1221 is made of shape memory alloy material, when the lifting drive line 1221 is powered on and the temperature rises to a certain phase change temperature, phase change deformation will occur, and the larger the diameter of the lifting drive line 1221 and the larger the mass of the lifting drive line 1221, the higher the current required to reach the phase change temperature, and the power consumption required by the lifting drive line 1221 is also greater. In addition, the lifting drive line 1221 with a larger diameter dissipates heat slowly and takes a long time to restore its initial shape. The diameter of the lifting drive line 1221 used in the present invention is less than or equal to 0.10 mm. In an optional embodiment, the diameter range of the selected lifting drive line 1221 is 0.02 mm to 0.05 mm. The current required for the lifting drive line 1221 to reach the phase change temperature within this diameter range is low, which can effectively reduce power consumption and has high heat dissipation efficiency. The lifting drive line 1221 restores its initial shape quickly, effectively improving the lifting efficiency of the point display component 121.

[0037] like Figure 8 As shown, the metal spring 1222 includes a fixed portion 221, an elastic portion 222, a bent portion 223 and a platform portion 224. One end of the fixed portion 221 is fixed to the installation body 11, and the other end of the fixed portion 221 is connected to one end of the elastic portion 222. The other end of the elastic portion 222 is connected to one end of the bent portion 223, and the other end of the bent portion 223 is connected to the platform portion 224, so that a step is formed between the elastic portion 222 and the platform portion 224, and the point display element 121 is in contact with the platform portion 224. It should be noted that the metal spring 1222 is an integrated structure, and for the convenience of description, it is divided into a fixed portion 221, an elastic portion 222, a bent portion 223 and a platform portion 224. In an optional embodiment, in order to reduce the volume of the device, the metal springs 1222 are arranged on the installation body 11 in pairs and staggered, and the shapes of the two opposite metal springs 1222 match each other.

[0038] In addition, the metal spring 1222 and the indicator 121 are designed to be split, that is, the indicator 121 is in contact with the platform 224. Figure 2 As shown, the point indicator 121 is arranged in the slide rail space 111, and the point indicator 121 can only be lifted and lowered within the path defined by the slide rail space 111. In this way, it is avoided that when the lifting drive line 1221 drives the metal spring 1222 to deform, it causes the point indicator 121 to produce other rotational displacements except the telescopic displacement.

[0039] The working principle of the above-mentioned braille display device is as follows: Fig. 9 As shown, when the lifting drive line 1221 is energized, the lifting drive line 1221 deforms and contracts. At this time, the lifting drive line 1221 applies a force to the elastic end A of the metal spring 1222, thereby pulling the elastic end A of the metal spring 1222 to deform upward, and then driving the point display component 121 to extend from the telescopic hole 113 through the elastic end A of the metal spring 1222. At the same time, the locking drive component 132 drives the locking movable plate 131 to move, so that the through hole 1311 of the locking movable plate 131 is misaligned with the protrusion 1211, limiting the position of the point display component 121. At this time, the lifting drive line 1221 is powered off, and the point display component 121 still remains in the extended state. Fig.10 As shown, when the lifting drive line 1221 is powered off, the lifting drive line 1221 returns to its initial shape. At this time, the lifting drive line 1221 does not exert force on the metal spring 1222, and the elastic end A of the metal spring 1222122 returns to its original state due to the elastic force. At the same time, the locking drive assembly 132 drives the locking movable plate 131 to move, so that the through hole 1311 of the locking movable plate 131 is aligned with the protrusion 1211, and the point display element 121 retracts from the telescopic hole 113 due to the lack of supporting force.

[0040] like Fig.11 As shown, the braille display is composed of a plurality of display modules 1 arranged and combined. Since each display module 1 in the present invention effectively reduces the volume of each display module 1 based on the lifting drive line 1221 and the metal spring 1222 structure, the adjacent display modules 1 can be arranged and combined more compactly, effectively ensuring the spacing between the display components 121, thereby improving the accuracy of the braille character display, and since the display module 1 is small in size, the braille display of the present invention can display more characters under the same area. In addition, since the lifting structures 122 of the present invention are all located directly below the display components 121, the lifting structures 122 do not need to occupy space outside the display components 121, so that the display modules 1 can be arranged and combined in both horizontal and vertical directions, effectively improving the application flexibility of the display modules 1.

[0041] Please refer to Figure 12 to Figure 14 , Embodiment 2 of the present invention is: A braille display device is different from the first embodiment in that the straight line where the lifting drive line 1221 is located and the plane where the metal spring sheet 1222 is located are parallel to each other.

[0042] In this embodiment, a first end of the lifting driving wire 1221 is fixed to a side of the installation body 11 close to the fixing portion 221 , and a second end of the lifting driving wire 1221 is connected to the platform portion 224 .

[0043] In this embodiment, there are many ways to connect the lifting driving line 1221 to the metal spring 1222: The first one, such as Fig.12 As shown, the lifting drive line 1221 is a straight line, one end of the lifting drive line 1221 is fixed to the metal fixing plate 14, the platform portion 224 of the metal spring 1222 is provided with an extension portion 225, the other end of the lifting drive line 1221 is fixed to the extension portion 225, and the lifting drive line 1221 is electrically connected to the extension portion 225. At this time, both ends of the lifting drive line 1221 are electrically connected, which facilitates the assembly of the lifting drive line 1221 and the metal spring 1222.

[0044] The second type, such as Fig.13 As shown, the lifting drive line 1221 is U-shaped, the open end of the lifting drive line 1221 is fixed to the metal fixing plate 14, the platform portion 224 of the metal spring 1222 is provided with an extension portion 225, the extension portion 225 is provided with a nail pile 226, the bent end of the lifting drive line 1221 is wound around the nail pile 226, and there is only a physical connection between the lifting drive line 1221 and the nail pile 226. Among them, since the lifting drive line 1221 is U-shaped, the force provided by one metal wire is equivalent to the force provided by two metal wires, which effectively improves the driving effect of the lifting drive line 1221.

[0045] The third type, such as Fig.14 As shown, the lifting drive line 1221 is U-shaped, the open end of the lifting drive line 1221 is fixed to the metal fixing plate 14, the platform portion 224 of the metal spring 1222 is provided with an extension portion 225, the bent end of the lifting drive line 1221 is wound around the extension portion 225, and there is only a physical connection between the lifting drive line 1221 and the extension portion 225.

[0046] In the above three connection modes, when the lifting driving wire 1221 and the metal spring 1222 are parallel to each other, the force generated by the lifting driving wire 1221 can be effectively applied to the metal spring 1222, thereby improving the utilization efficiency of the force of the lifting driving wire 1221. In addition, if the lifting driving wire 1221 and the metal spring 1222 are not completely parallel, it does not affect the effect that the lifting driving wire 1221 can drive the metal spring 1222 to produce deformation.

[0047] Please refer to Figure 15 to Figure 16 , Embodiment 3 of the present invention is: A braille display device is different from the first embodiment in that a straight line where the lifting drive line 1221 is located and a plane where the metal spring sheet 1222 is located are defined to be perpendicular to each other.

[0048] In this embodiment, the first end of the lifting driving line 1221 is fixed to the area of ​​the installation body 11 opposite to the elastic part 222, and the second end of the lifting driving line 1221 is connected to the elastic part 222. Fig.15 As shown, the lifting drive line 1221 is U-shaped, and the open end of the lifting drive line 1221 is fixed to the area opposite to the installation body 11 and the elastic part 222, so that the lifting drive line 1221 is in a suspended state, and the bent end of the lifting drive line 1221 is wound around the elastic part 222 of the metal spring 1222. When the lifting drive line 1221 is deformed after being energized, the lifting drive line 1221 applies an upward force to the elastic part 222 of the metal spring 1222, thereby pulling the platform part 224 of the metal spring 1222 to deform upward.

[0049] It should be noted that the present invention converts the small deformation amount generated by the lifting driving line 1221 into a large displacement amount of the point display element 121 through the metal spring 1222. Specifically, Fig.16 As shown, when the lifting driving line 1221 is fixed to the elastic part 222, the distance between the deformation point 1 and the fixed end B is s1, and when the lifting driving line 1221 is fixed to the platform part 224, the distance between the deformation point 2 and the fixed end B is s2, where s1 is smaller than s2. After the lifting driving line 1221 with a distance of s1 is energized, a contraction deformation h1 is generated, so that the angle formed by the metal spring 1222 at the fixed end B is α, and after the lifting driving line 1221 with a distance of s2 is energized, a contraction deformation h2 is generated, so that the angle formed by the metal spring 1222 at the fixed end B is also α. Based on the trigonometric tangent function, we can know that tanα=h1 / s1=h2 / s2. Since the distance s1 is smaller than the distance s2, the contraction deformation h1 is smaller than the contraction deformation h2. That is, when the platform portion 224 of the metal spring 1222 produces the same displacement, the closer the deformation point fixed by the lifting drive line 1221 is to the fixed end B, the smaller the deformation required by the lifting drive line 1221.

[0050] In addition, in the above connection mode, when the lifting driving wire 1221 and the metal spring 1222 are perpendicular to each other, the force generated by the lifting driving wire 1221 can be effectively applied to the metal spring 1222, thereby improving the utilization efficiency of the force of the lifting driving wire 1221. In addition, if the lifting driving wire 1221 and the metal spring 1222 are not completely perpendicular, it does not affect the effect that the lifting driving wire 1221 can drive the metal spring 1222 to produce deformation.

[0051] Please refer to Fig.17 , Embodiment 4 of the present invention is: A braille display, which is different from the first embodiment in that: like Fig.17 As shown, the locking drive assembly 132 includes a first metal wire 1321 and a second metal wire 1322. The first metal wire 1321 and the second metal wire 1322 are both made of shape memory alloy material. The head end and the tail end of the first metal wire 1321 are respectively fixed to the two ends of the first side of the installation body 11, and the middle part of the first metal wire 1321 is fixed to the locking moving plate 131. The head end and the tail end of the second metal wire 1322 are respectively fixed to the two ends of the second side of the installation body 11, and the middle part of the second metal wire 1322 is fixed to the locking moving plate 131. The first side is opposite to the second side. Among them, the head end and the tail end of the first metal wire 1321 are located on the same straight line, the head end and the tail end of the second metal wire 1322 are located on the same straight line, and the first side and the second side of the installation body 11 are respectively located on both sides of the locking moving plate 131. An anchor block 1312 is provided on both sides of the locking movable plate 131 , respectively. The distance between the two anchor blocks 1312 is smaller than the distance between the first metal wire 1321 and the second metal wire 1322 . The middle parts of the first metal wire 1321 and the second metal wire 1322 are wound around the anchor block 1312 .

[0052] Among them, the types of shape memory alloy materials used by the first metal wire 1321 and the second metal wire 1322 are different, and the deformation states produced after power-on are also different. In this embodiment, the working principle of the locking drive assembly 132 driving the locking movable plate 131 to move on the installation body 11 is specifically as follows: when the first metal wire 1321 and the second metal wire 1322 are powered on, the first metal wire 1321 is deformed and contracted to shorten its length, and the second metal wire 1322 is deformed and expanded to lengthen its length. At this time, the first metal wire 1321 applies a force to the locking movable plate 131, thereby pulling the locking movable plate 131 to move to the first side. When the first metal wire 1321 and the second metal wire 1322 are powered off, the first metal wire 1321 and the second metal wire 1322 restore their initial shapes. At this time, the second metal wire 1322 applies a force to the locking movable plate 131, thereby pulling the locking movable plate 131 to move back to the original position to the second side.

[0053] Please refer to Figure 18 to Figure 19 , Embodiment 5 of the present invention is: A braille display, which is different from the first embodiment in that: like Fig.18As shown, the locking drive assembly 132 includes a first metal wire 1321 and an elastic telescopic member 1323. The first metal wire 1321 is made of shape memory alloy material. One end of the first metal wire 1321 is fixed to the first side of the installation body 11, and the other end of the first metal wire 1321 is fixed to the locking moving plate 131. One end of the elastic telescopic member 1323 is fixed to the second side of the installation body 11, and the other end of the elastic telescopic member 1323 is fixed to the locking moving plate 131. The first side is opposite to the second side.

[0054] Among them, Fig.19 As shown, a groove 114 is provided on one side of the installation body 11 close to the locking movable plate 131 , and the groove 114 is used to accommodate the first metal wire 1321 , thereby improving the space utilization rate in the device and reducing the volume of the device.

[0055] Please refer to Figure 20 to Figure 23 , Embodiment 6 of the present invention is: A braille display, which is different from the fifth embodiment in that: The plane where the elastic expansion member 1323 is located is parallel to the plane where the locking movable plate 131 is located.

[0056] like Fig. 20 and Fig.21 As shown, the elastic expansion member 1323 includes a connecting portion 321 and a serpentine spring 322. The connecting portion 321 is covered on the locking movable plate 131, and a hollow area 3211 opposite to the through hole 1311 is provided on the connecting portion 321. One end of the serpentine spring 322 is fixed to the second side of the mounting body 11, and the other end of the serpentine spring 322 is connected to the connecting portion 321. The serpentine spring 322 is made in a wave-like (serpentine) bending, and there is a certain interval between each wave, forming a series of evenly distributed bending areas.

[0057] In an optional embodiment, if Fig. 22 As shown, the elastic expansion member 1323 may be a coil spring, and the projection area of ​​the coil spring on the locking movable plate 131 overlaps with the projection area of ​​the first metal wire 1321 on the locking movable plate 131 .

[0058] In an optional embodiment, if Fig.23 As shown, the elastic telescopic member 1323 can be two coil springs, and the two coil springs are respectively arranged on both sides of the locking movable plate 131.

[0059] In an optional embodiment, the elastic telescopic member 1323 is also made of a shape memory alloy material, which is deformed after being energized, thereby pulling the locking movable plate 131 to move toward the second side.

[0060] In this embodiment, the working principle of the locking driving assembly 132 driving the locking movable plate 131 to move on the installation body 11 is specifically as follows: when the first metal wire 1321 is powered on, the first metal wire 1321 is deformed and contracted, resulting in a shortened length. At this time, the first metal wire 1321 applies a force to the locking movable plate 131, thereby pulling the locking movable plate 131 to move toward the first side. When the first metal wire 1321 is powered off, the first metal wire 1321 returns to its initial shape. At this time, the elastic elastic member 1323 applies a force to the locking movable plate 131 due to its elastic restoring force, thereby pulling the locking movable plate 131 to move back to the original position toward the second side.

[0061] Please refer to Figure 24 to Figure 25 , Embodiment 7 of the present invention is: A braille display, which is different from the fifth embodiment in that: The plane where the elastic expansion member 1323 is located is perpendicular to the plane where the locking movable plate 131 is located.

[0062] like Fig.24 and Fig.25 As shown, the elastic expansion member 1323 includes a first serpentine spring 323 and a second serpentine spring 324. The first serpentine spring 323 and the second serpentine spring 324 are respectively arranged on the third side and the fourth side opposite to the mounting body 11. One end of the first serpentine spring 323 is fixed to an end of the third side close to the second side, and the other end of the first serpentine spring 323 is fixed to an end of the locking movable plate 131 close to the third side. One end of the second serpentine spring 324 is fixed to an end of the fourth side close to the second side, and the other end of the second serpentine spring 324 is fixed to an end of the locking movable plate 131 close to the fourth side.

[0063] It should be noted that, in this embodiment, the elastic member 1323 and the locking movable plate 131 can be an integrally formed structure. In addition to being able to pull the locking movable plate 131 to move toward the second side, the first serpentine spring 323 and the second serpentine spring 324 can also connect the first metal wire 1321 and the power supply to realize power supply to the first metal wire 1321 because the locking movable plate 131 is made of metal material.

[0064] In summary, the present invention provides a Braille point display device, which uses a shape memory alloy material as a lifting drive wire. When powered on, the lifting drive wire is controlled to deform, thereby driving the metal spring to deform accordingly, thereby driving the point display component to extend or retract relative to the installation body. The present invention realizes lifting drive with a metal wire structure, reduces the occupied space of the Braille convex dot driving structure, and effectively saves 80% of the height space compared to the electromagnetically driven Braille point display device, reduces the volume of the device, and does not have electromagnetic interference. In addition, compared with piezoelectric materials and electromagnetic components, the metal wire structure of the shape memory alloy material is lighter in weight, which improves the portability of the device. At the same time, the deformable metal wire structure of the present invention is connected to the elastic end of the metal spring, so that the smaller deformation amount generated by the metal wire structure is amplified into the larger deformation amount of the metal spring, thereby driving the point display component to lift and lower, and ensuring the accuracy of the lifting effect of the point display component. In addition, the metal wire structure of the shape memory alloy material of the present invention requires a small current to produce deformation, and is also equipped with a locking mechanism to lock the lifting position of the point display component, so that the driving metal wire does not need to be continuously powered on to maintain the position, effectively reducing the overall power consumption of the device. The locking mechanism of the present invention uses a metal wire made of a shape memory alloy material for translational driving, which effectively reduces the occupied volume of the point display component in the height space.

[0065] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A braille display, characterized in that: It comprises a plurality of dot display modules, each of which comprises a plurality of dot display mechanisms and locking mechanisms arranged in a mounting body, and a slide rail space is arranged in the mounting body; Each of the point display mechanisms comprises a point display component and a lifting structure, wherein the point display component is arranged in the slide rail space and abuts against the lifting structure; The lifting structure is made of shape memory alloy material, and is connected to a power source. When powered on, the lifting structure deforms, so that the point display element extends or retracts relative to the installation body. The locking mechanism is used to limit the lifting and lowering displacement of the point indicator so that the point indicator maintains the extended or retracted state.

2. A Braille display according to claim 1, characterized in that: The locking mechanism comprises a locking movable plate and a locking drive assembly; The locking movable plate is movably arranged on the mounting body; The locking movable plate is provided with a through hole opposite to the point display component, the point display component is provided with a convex portion, and the shape and size of the through hole match the convex portion; The locking drive assembly is used to drive the locking movable plate to move on the mounting body so that the through hole is misaligned or aligned with the protruding portion.

3. A Braille display according to claim 1, characterized in that: The lifting structure includes a lifting drive line and a metal spring; The lifting drive line is made of shape memory alloy material and is connected to a power source; The elastic end of the metal spring is in contact with the point display element; The fixed end of the metal spring away from the point display element is fixed to the installation body, the first end of the lifting drive line is fixed to the installation body, and the second end of the lifting drive line is connected to the elastic end of the metal spring; The straight line where the lifting drive line is located and the plane where the metal spring sheet is located are parallel to or perpendicular to each other.

4. A Braille display according to claim 3, characterized in that: The metal spring sheet comprises a fixing portion, an elastic portion, a bending portion and a platform portion; One end of the fixing portion is fixed to the mounting body, and the other end of the fixing portion is connected to one end of the elastic portion; The other end of the elastic part is connected to one end of the bent part, and the other end of the bent part is connected to the platform part, so that a step shape is formed between the elastic part and the platform part. The point display element is in contact with the platform portion.

5. A Braille display according to claim 4, characterized in that: The straight line where the lifting drive line is located is parallel to the plane where the metal spring is located, the first end of the lifting drive line is fixed to the side of the installation body close to the fixing part, and the second end of the lifting drive line is connected to the platform part.

6. A Braille display according to claim 4, characterized in that: The straight line where the lifting drive line is located is perpendicular to the plane where the metal spring is located. The first end of the lifting drive line is fixed to the area where the installation body is opposite to the elastic part, and the second end of the lifting drive line is connected to the elastic part.

7. A Braille display according to claim 2, characterized in that: The locking drive assembly includes a first metal wire and a second metal wire; The first metal wire and the second metal wire are both made of shape memory alloy material; The head end and the tail end of the first metal wire are respectively fixed to the two ends of the first side of the installation body, and the middle part of the first metal wire is fixed to the locking movable plate; The head end and the tail end of the second metal wire are respectively fixed to the two ends of the second side of the installation body, and the middle part of the second metal wire is fixed to the locking movable plate; The first side is opposite to the second side.

8. A Braille display according to claim 2, characterized in that: The locking drive assembly includes a first metal wire and an elastic telescopic member; The first metal wire is made of shape memory alloy material; One end of the first metal wire is fixed to the first side of the mounting body, and the other end of the first metal wire is fixed to the locking movable plate; One end of the elastic telescopic member is fixed to the second side of the mounting body, and the other end of the elastic telescopic member is fixed to the locking movable plate; The first side is opposite to the second side.

9. A Braille display according to claim 8, characterized in that: The plane where the elastic telescopic member is located is parallel to the plane where the locking movable plate is located; The elastic expansion member comprises a connecting portion and a serpentine spring; The connecting portion is covered on the locking movable plate, and a hollow area opposite to the through hole is provided on the connecting portion; One end of the serpentine spring is fixed to the second side of the mounting body, and the other end of the serpentine spring is connected to the connecting portion.

10. A braille display according to claim 8, characterized in that: The plane where the elastic telescopic member is located is perpendicular to the plane where the locking movable plate is located; The elastic telescopic member comprises a first serpentine spring and a second serpentine spring, wherein the first serpentine spring and the second serpentine spring are respectively arranged on a third side and a fourth side opposite to the mounting body; One end of the first serpentine spring is fixed to one end of the third side close to the second side, and the other end of the first serpentine spring is fixed to one end of the locking movable plate close to the third side; One end of the second serpentine spring is fixed to an end of the fourth side close to the second side, and the other end of the second serpentine spring is fixed to an end of the locking moving plate close to the fourth side.

Images