Braille dot matrix display device with self-locking function

Abstract

The utility model relates to the technical field of braille dot matrixes, in particular to a braille dot matrix display device with a self-locking function. A braille dot matrix display device with a self-locking function comprises a base, a middle shell and the like, the top of the base is fixedly connected with the middle shell, the top of the middle shell is fixedly connected with a top cover, six contact blocks are slidably arranged on the top cover at intervals, six electromagnet assemblies are evenly arranged in the base, and jacking assemblies are arranged in the six electromagnet assemblies. The six jacking assemblies correspond to the six contact blocks respectively. According to the utility model, the permanent magnet and the ejector pin move up and down by controlling the current direction so as to drive the contact block to ascend and descend, and self-locking is realized when the contact block ascends to the highest position or descends to the lowest position by utilizing the interaction of the steel ball, the iron core and the ejector pin, so that the problem that most braille display devices are difficult to realize dot matrix self-locking is solved, and the heating value is effectively reduced; stable touch force feedback is provided for a user, and the reading requirements of visually impaired people are better met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of braille dot matrix, especially to a braille dot matrix display device with self-locking function. BACKGROUND

[0002] According to the estimation of the World Health Organization, the number of blind people in the world has approached 45 million, among which the size of blind people in China is about 8.3 million, accounting for about 21% of the total number of blind people in the world. Due to the superimposed influence of multiple factors such as population aging, the number of blind people is continuously rising. Blind people mainly rely on hearing and touch to absorb knowledge, however, although hearing feedback is convenient and easy to obtain, it is also accompanied by the short board of being easily disturbed by the external environment, limited thinking depth and poor memory effect.

[0003] In contrast, touch reading has obvious advantages. It obtains information by touching and identifying the braille on paper braille books (each side is composed of 3x2 dot matrix), and since it does not rely on sound, it is not easily disturbed by the external environment, and blind people can read comfortably in any noisy scene. Moreover, when touch reading, blind people can repeatedly touch and perceive according to their own rhythm, avoiding information omission or misunderstanding that may exist due to the instantaneous nature of auditory reading, ensuring the integrity of information acquisition, and thus improving reading efficiency.

[0004] Braille display device, with its dense arrangement of touch point concave-convex combination, can dynamically display braille or graphical information, providing real-time information and massive knowledge for visually impaired people, becoming an indispensable bridge for them to integrate into modern society. Electromagnetic drive technology, with its excellent mechanical properties, high frequency response capability and compact structure design, has become an ideal choice for precise switching of the height position of the touch point in the braille display device. However, due to the narrow spacing between braille dot matrix and the large number of electromagnetic drivers required, most braille display devices face challenges such as high heat generation and insufficient touch force feedback due to the difficulty of achieving dot matrix self-locking. SUMMARY

[0005] In order to overcome the shortcomings in the prior art, the utility model provides a braille dot matrix display device with self-locking function.

[0006] The technical implementation scheme of the utility model is: a braille dot matrix display device with self-locking function, comprising a base, a middle shell, a top cover, a touch block, an electromagnet assembly and a lifting assembly, the base is fixedly connected with the middle shell at the top, the middle shell is fixedly connected with the top cover at the top, six touch blocks are arranged on the top cover in a spaced sliding manner, six electromagnet assemblies are evenly arranged in the base, the six electromagnet assemblies are arranged in the base in a three-by-two manner, the six electromagnet assemblies are provided with lifting assemblies, and the six lifting assemblies correspond to the six touch blocks respectively.

[0007] Further, the electromagnet assembly comprises the coil frame, the core, the coil and the pin, six coil frames are evenly arranged in three by two in the base, the core is fixedly connected to the upper part of the six coil frames in an embedded manner, the coil is arranged on the outer wall of the six coil frames, six pairs of pin holes are formed on the bottom panel of the base, the six pairs of pin holes correspond to the six coil frames respectively, the pin is arranged in the pin hole, the pin is electrically connected with the adjacent coil, the lower end of the pin is electrically connected with the external circuit board, and the circuit board supplies power to the coil through the pin.

[0008] Further, the jacking assembly comprises the permanent magnet, the ejector pin and the steel ball, the permanent magnet is arranged on the lower side of the six coil frames in a sliding mode, the ejector pin is fixedly connected to the top of the six permanent magnets, the six ejector pins can penetrate the adjacent cores and extend upwards, the tapered opening is formed in the top of the six cores, the steel ball is arranged in the tapered opening formed in the top of the six cores, and the top of the six ejector pins is cut into a tapered surface.

[0009] Further, the top of the six contact blocks is provided with a chamfer in the circumferential direction.

[0010] Further, the ejector pin is made of non-magnetic stainless steel, and the contact block is made of non-magnetic aluminum.

[0011] Further, the outer wall of the six permanent magnets is polished.

[0012] The utility model has the advantages that: the utility model realizes the up-down movement of the permanent magnet and the ejector pin by controlling the current direction, thereby driving the contact block to ascend and descend, and realizing self-locking when the contact block ascends to the highest position or descends to the lowest position by utilizing the interaction between the steel ball and the core and the ejector pin, thereby solving the problem that most Braille display devices are difficult to dot-matrix self-locking, effectively reducing the heat generation, providing stable touch feedback for the user, and better meeting the reading needs of visually impaired people. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a three-dimensional structure schematic view of the utility model.

[0014] Figure 2 It is a three-dimensional structure schematic view of the base, the coil frame and the core of the utility model.

[0015] Figure 3 It is a three-dimensional structure schematic view of the coil frame, the core and the contact block of the utility model.

[0016] Figure 4 It is a three-dimensional structure sectional view of the coil frame, the core and the ejector pin of the utility model.

[0017] Figure 5 It is a stress analysis diagram of the steel ball when being jacked up.

[0018] In the above figures: 1: base, 2: middle shell, 21: top cover, 22: contact block, 31: coil skeleton, 32: iron core, 33: coil, 34: pin, 41: permanent magnet, 42: ejector pin, 43: steel ball, 44: conical opening, 45: conical surface. DETAILED DESCRIPTION

[0019] Reference herein to an embodiment means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present invention. The appearance of such a phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0020] Example: A Braille dot matrix display device with a self-locking function, such as Figures 1-5 As shown, it includes a base 1, a middle shell 2, a top cover 21, a contact 22, an electromagnet assembly and a lifting assembly. The middle shell 2 is fixedly connected to the top of the middle shell 2, and the top cover 21 is fixedly connected to the top of the middle shell 2. Six contacts 22 are slidingly arranged at intervals on the top cover 21. Six electromagnet assemblies are evenly arranged in the base 1. The six electromagnet assemblies are arranged in a three-by-two manner in the base 1. The six electromagnet assemblies are all provided with a lifting assembly, and the six lifting assemblies correspond to the six contacts 22 respectively. The above-mentioned fixed connection methods include snap fastening, latches or screw tightening.

[0021] like Figure 2 、 Figure 3 and Figure 4 As shown, the electromagnet assembly includes a coil skeleton 31, an iron core 32, a coil 33 and a pin 34. Six coil skeletons 31 are evenly arranged in a three by two manner in the base 1. The upper part of the six coil skeletons 31 is embedded and bonded with an iron core 32, and the outer wall of the six coil skeletons 31 is wound with a coil 33. Six pairs of pin holes are opened on the bottom panel of the base 1, and the six pairs of pin holes correspond to the six coil skeletons 31 respectively. Pins 34 are inserted in the pin holes, and the pins 34 are electrically connected to the adjacent coils 33. The lower end of the pin 34 is electrically connected to the external circuit board, and the circuit board supplies power to the coils 33 through the pins 34.

[0022] like Figure 2 and Figure 4As shown, the lifting assembly includes a permanent magnet 41, a thimble 42 and a steel ball 43. The permanent magnet 41 is slidably set on the lower side of the six coil skeletons 31. The top of the six permanent magnets 41 is bonded and fixed with a thimble 42. The six thimbles 42 can penetrate the adjacent iron cores 32 and extend upward. The top of the six iron cores 32 is provided with a conical opening 44. The steel ball 43 is placed in the conical opening 44 opened at the top of the six iron cores 32. The top of the six thimbles 42 is cut into a conical surface 45. The thimble 42 is made of non-magnetic stainless steel, and the contact block 22 is made of non-magnetic aluminum. The outer walls of the six permanent magnets 41 are ground and polished, so as to reduce the friction between the permanent magnet 41 and the coil skeleton 31, improve the operating efficiency of the device, and reduce energy consumption.

[0023] When using the present Braille dot matrix display device, when a forward or reverse current is passed through the coil 33, the bottom of the iron core 32 will exhibit different magnetic properties (i.e., the N pole or the S pole), thereby generating an attractive or repulsive force on the permanent magnet 41. Therefore, by precisely controlling the direction of the current, the up and down movement of the permanent magnet 41 can be achieved, and its movement amount is about 1.1 mm. Since the ejector pin 42 is connected to the permanent magnet 41, when the permanent magnet 41 moves up and down, the ejector pin 42 will also be driven to move up and down. The top of the iron core 32 is designed to be in the shape of a conical opening 44, and the steel ball 43 is placed therein. When the ejector pin 42 is pushed upward, the steel ball 43 will be pushed upward from the bottom of the conical opening 44 and move to one side. When the ejector pin 42 moves to the position shown in FIG. Figure 3 When the contact block 22 is in the position shown in the middle, the contact block 22 will be synchronously lifted to the highest position. At this time, the ejector pin 42 has exceeded the rightmost position of the steel ball 43, and the movement ends here. The coil 33 immediately stops supplying power. Since the permanent magnet 41 has a magnetic attraction on the iron core 32, the ejector pin 42 can remain in this position without falling. When the user's finger touches or presses the contact block 22, the contact block 22 will apply a vertical downward pressure on the steel ball 43. At this time, the left side of the steel ball 43 is tightly fitted with the side wall of the tapered opening 44 of the iron core 32, and the right side is in contact with the vertical side of the ejector pin 42 (the force analysis of the steel ball 43 at this time is shown in FIG. Figure 5 As shown), in this case, the steel ball 43 can only apply a horizontal thrust to the ejector pin 42, but cannot cause the ejector pin 42 to move in the vertical direction, so the ejector pin 42 will not fall, thereby realizing the self-locking function of the contact block 22. In addition, by providing a chamfer on the top of the contact block 22, the top of the contact block 22 is made smoother. In this way, when the user's hand contacts the contact block 22, there will be no discomfort caused by the sharp corners of the contact block 22, thereby improving the comfort of use. Similarly, when a reverse current is passed through the coil 33, the permanent magnet 41 and the ejector pin 42 will move downward together until they reach the position shown in FIG. Figure 3When the lowest position shown in the left and right sides, at this time, the steel ball 43 will be attracted to the bottom of the conical opening 44 opened at the top of the iron core 32 under the action of electromagnetic force, and the contact block 22 will naturally fall under the action of gravity, when the permanent magnet 41 is close to the side of the base 1, the reverse current stops, and the top pin 42 and the contact block 22 can be kept at the current lowest position by the attraction of the permanent magnet 41 to the base 1.

[0024] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and it cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A Braille dot matrix display device with a self-locking function, characterized in that: The invention comprises a base (1), a middle shell (2), a top cover (21), a contact block (22), an electromagnet assembly and a lifting assembly, wherein the top of the base (1) is fixedly connected to the middle shell (2), the top of the middle shell (2) is fixedly connected to the top cover (21), six contact blocks (22) are arranged on the top cover (21) in an interval sliding manner, six electromagnet assemblies are evenly arranged in the base (1), and the six electromagnet assemblies are arranged in a three by two manner in the base (1), and the six electromagnet assemblies are all provided with a lifting assembly, and the six lifting assemblies correspond to the six contact blocks (22) respectively.

2. A Braille dot matrix display device with a self-locking function according to claim 1, characterized in that: The electromagnet assembly includes a coil frame (31), an iron core (32), a coil (33) and a pin (34). Six coil frames (31) are evenly arranged in a three-by-two manner in the base (1). The upper parts of the six coil frames (31) are all embedded and fixedly connected with the iron core (32). The outer walls of the six coil frames (31) are all wound with coils (33). Six pairs of pin holes are opened on the bottom panel of the base (1). The six pairs of pin holes correspond to the six coil frames (31) respectively. Pins (34) are inserted into the pin holes. The pins (34) are electrically connected to adjacent coils (33). The lower ends of the pins (34) are electrically connected to an external circuit board. The circuit board supplies power to the coils (33) through the pins (34).

3. A Braille dot matrix display device with a self-locking function according to claim 2, characterized in that: The lifting assembly includes a permanent magnet (41), a thimble (42) and a steel ball (43), the permanent magnet (41) is slidably arranged on the lower side of the six coil skeletons (31), the top of the six permanent magnets (41) is fixedly connected to the thimble (42), the six thimbles (42) can penetrate the adjacent iron cores (32) and extend upward, the top of the six iron cores (32) is provided with a conical opening (44), the conical opening (44) provided on the top of the six iron cores (32) is provided with a steel ball (43), and the top of the six thimbles (42) is cut into a conical surface (45).

4. A Braille dot matrix display device with a self-locking function according to claim 3, characterized in that: The tops of the six contact blocks (22) are all chamfered along the circumferential direction.

5. A Braille dot matrix display device with a self-locking function according to claim 4, characterized in that: The ejector pin (42) is made of non-magnetic stainless steel, and the contact block (22) is made of non-magnetic aluminum.

6. A Braille dot matrix display device with a self-locking function according to claim 5, characterized in that: The outer walls of the six permanent magnets (41) are all ground and polished.

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