CN221281645U

CN221281645U - Friction type locking mechanism of braille point display module

Info

Publication number: CN221281645U
Application number: CN202420160556.6U
Authority: CN
Inventors: 郦铖; 陈洪; 付文柯; 曹秀秀
Original assignee: Chongqing Wujie Qihang Innovation Technology Co ltd
Current assignee: Chongqing Wujie Qihang Innovation Technology Co ltd
Priority date: 2023-04-24
Filing date: 2024-01-22
Publication date: 2024-07-05
Anticipated expiration: 2034-01-22
Also published as: CN117765797A; CN221304122U; CN117711241A; CN220065000U; CN117789570A

Abstract

The utility model discloses a friction type locking mechanism of a Braille point display module, which comprises a locking part I, a locking plate, a driving mechanism for driving the locking plate to move and an elastic reset piece for driving the locking plate to reset, wherein the locking plate is provided with a locking groove; the locking plate is provided with a plurality of locking parts II which can be respectively matched with the locking parts I to lock the salient point parts of the corresponding point display units in an extending state or a shrinking state; the locking component I and the locking component II are matched in a friction side mode, so that after the convex point ascends, a reverse friction force (larger than gravity) is given to the gravity direction of the convex point to prevent the convex point from falling back, the convex point can be kept at the position without continuously supplying power to the driving mechanism, the position change of the convex point caused by touch, gravity and the like is avoided, and disorder of display information is avoided. The power consumption of the whole equipment can be reduced, and a foundation is laid for miniaturization and portability of the Braille point display.

Description

Friction type locking mechanism of braille point display module

Priority application

The application requires a Chinese patent application [ application number ] filed 24 days 4/2023: 2023104477714 [ application name ]: priority to point display unit, point display module and braille point display, the priority patent application is incorporated by reference in its entirety.

Technical Field

The utility model belongs to the technical field of braille displays, and particularly relates to a friction type locking mechanism of a braille point display module.

Background

The blind person can not watch things by eyes like normal people, and the blind person can acquire external information mainly by means of hearing of ears and touch of fingers. In order to facilitate the culture learning and information exchange of the blind, the literature data of some Chinese, english, french or other national languages are often converted into braille books for the blind to read, wherein braille is also called braille or raised word, which is a word specially designed for the blind and mainly depends on touch perception. Typically each braille comprises 6 dots, which are equally divided into two groups arranged side by side. And the braille books are formed by manufacturing braille with different combinations on paper through a braille plate, a braille machine or a braille printer.

With the development of informatization and the popularization of personal computers, there is now a braille conversion software for Chinese characters which can be installed on a computer and can convert Chinese characters in the computer into braille codewords, but the personal computer generally displays images or characters through a screen, and the blind cannot read braille displayed on the computer although the personal computer can convert Chinese characters into braille. The point display is also called a blind person display or a braille machine, and can synchronously display information on a computer by braille, so that the blind person can conveniently touch and read the information, and characters read by the screen reading software can be displayed on the point display by braille by being matched with the screen reading software. The braille on the point display can be automatically raised by pressing the points, and the blind person can feel the characters through touch.

The prior Braille point display consists of a plurality of point display units, and the point display units can protrude out of a plane to form a salient point. The six point display units are arranged in a group of 2 rows and 3 columns, and a plurality of combinations are formed by or protruding out of a plane or being positioned in the plane, and each combination represents one Braille symbol. The blind person reads through touching instead of vision.

Since the bump is retracted into the plane of the value by touch or gravity, a continuous driving force is required to maintain the bump position. Thus, the mechanism for driving the convex points needs to be continuously powered, so that the power consumption of the Braille point display is larger. For example, CN112166462a performs locking by a control signal for controlling a solenoid. In view of this, there is a need for a locking mechanism that maintains the bumps in an extended state without the need for continuous power.

Disclosure of utility model

The utility model aims to provide a friction type locking mechanism of a Braille point display module, which can keep the current position, namely the extending state, even if a driving mechanism in the friction type locking mechanism is powered off after a convex point is lifted/produced.

In order to solve the technical problems, the utility model adopts the following technical scheme: a friction locking mechanism of a braille point display module, comprising: the locking component I is arranged at the bottom of each point display unit in the Braille point display module, the locking plate can translate, the driving mechanism is used for driving the locking plate to move, and the elastic reset piece is used for driving the locking plate to reset; the driving mechanism comprises a memory metal wire, and a plurality of locking parts II which can be respectively matched with the locking parts I to lock the salient point parts of the corresponding point display units in an extending state or a shrinking state are arranged on the locking plate; wherein the locking part I comprises a first friction side surface, and the locking part II comprises a second friction side surface which can be contacted with the first friction side surface to generate friction force;

When the memory metal wire is in an initial state, the first friction side surface and the second friction side surface are in contact so as to lock the bump component in a contracted state;

when the memory metal wire is electrified, the memory metal wire drives the locking plate to move, so that the first friction side surface is separated from the second friction side surface, and the bump component is unlocked;

When the salient point component stretches out and the memory metal wire is powered off, the elastic reset piece drives the locking plate to reset, so that the second friction side face is contacted with the first friction side face, and the salient point component is locked in the stretching state.

In some embodiments, the length of the first friction side (or the height of the first friction side extending axially along the connecting rod) is greater than the length of the second friction side (or the height of the second friction side extending in the height direction of the protrusion). The length of the first friction side surface on the locking block is longer, so that after the salient point component and the connecting rod are lifted, the second friction side surface on the friction block can be rapidly contacted with the first friction side surface under the action of the elastic reset piece, and then the salient point component is locked in a lifting state in time.

In some embodiments, the second friction side is provided with anti-slip texture for increasing friction.

In some embodiments, a limit is provided above the first friction side. The locking is performed in a friction manner, which is simpler and easier to implement in terms of the manufacturing process and the product structure, but if used for a long time, the friction between the friction sides may be impaired, so that the movement of the second friction side on the first friction side is limited by providing a limiting part on top of the first friction side.

In some embodiments, the locking component I is a locking rod disposed at a tail of the connecting rod, and the first friction side is disposed on a side wall of the locking rod adjacent to the locking component II; the locking part II is a protruding part arranged on two sides of the locking plate, and the second friction side surface is arranged on the side wall, close to the locking rod, of the protruding part.

In some embodiments, a guiding curved surface for guiding the first friction side surface to contact with the second friction side surface is further arranged on the protruding portion, and the guiding curved surface is arranged on the top of the second friction side surface.

In some embodiments, the first friction side surface and the second friction side surface are respectively provided with a tenon and a mortise which are matched and locked, when the salient point component stretches out, the locking component II is contacted with the locking component I under the driving of the locking plate, so that the tenon abuts against the bottom of the tenon groove to lock the salient point component in a stretching state.

In some embodiments, the elastic reset component is a reset spring formed by bending a steel sheet in the same plane, and the axial direction of the reset spring is perpendicular to the translation direction of the locking plate.

In some embodiments, two ends of the memory metal wire are respectively and fixedly connected with the locking plate and the mounting plate in the braille point display module.

In some embodiments, the braille point display module comprises six point display units arranged in a two-row and three-column mode, and the point display units comprise telescopic bump components and a telescopic driving mechanism for driving the bump components to stretch; the telescopic driving mechanism comprises a permanent magnet integrally arranged on the connecting rod and an electromagnetic coil which interacts with the permanent magnet to drive the permanent magnet to move;

The electromagnetic coils on the three point display units in the same row are in a delta-shaped structure in a vertical plane, and the directions of the delta-shaped structures of the two rows are opposite; and when the bump parts are in a contracted state, the permanent magnets on the point display units and the corresponding electromagnetic coils are positioned on the same horizontal plane.

In some embodiments, the point display units of the first column and the third column in one row are positioned at the same horizontal plane with the point display units of the second column in the other row, so that six point display units are in a double-layer structure; or alternatively

Wherein the first and third rows of point display units and the second row of point display units in one row are distributed on a first horizontal plane and a second horizontal plane; the point display units of the second row and the first and third rows of point display units are respectively positioned on a third horizontal plane and a fourth horizontal plane, wherein the heights of the first horizontal plane, the second horizontal plane, the third horizontal plane and the fourth horizontal plane are sequentially reduced, so that six point display units are in a four-layer structure from top to bottom.

The utility model has the advantages that: the utility model provides a locking mechanism, which locks a convex point through the friction type locking mechanism, so that the position of the convex point is kept without continuous power supply. The bump position change caused by touch, gravity and the like is avoided, and the disorder of displayed information is avoided. The power consumption of the whole equipment can be reduced, and a foundation is laid for miniaturization and portability of the Braille point display. And the friction side surfaces on the two locking parts are matched, so that the structure is simpler and the manufacturing cost is lower.

In addition, the electromagnetic coils of adjacent point display units in the same row and the same column are staggered on the plane, so that electromagnetic interference is reduced. Because the permanent magnet and the electromagnetic coil of the same point display unit are arranged on the same plane, the permanent magnet is staggered along with the electromagnetic coil after the electromagnetic coil is staggered in practice, and the electromagnetic interference between the adjacent point display units is further reduced. For example, the 6 point display units are arranged in four layers, and meanwhile, the permanent magnets are divided into 3 or 4 points, so that the electromagnetic interference resistance is strongest. For another example, on the premise of miniaturization, 6 point display units can be divided into two layers, and meanwhile, the permanent magnet is divided into 2 parts, so that the device has miniaturization and electromagnetic interference resistance.

In order to improve the magnetic force of the permanent magnet, the permanent magnet can be arranged to be sleeved on the connecting rod in a cylindrical shape or connected with the connecting rod as a whole.

In order to achieve the aim that the salient point parts can still be kept in the extending state when the power is removed, the Braille point display module further comprises a locking mechanism for locking a plurality of salient point parts in the six point display units in the extending state.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale. It will be apparent to those of ordinary skill in the art that the drawings in the following description are of some embodiments of the utility model and that other drawings may be derived from these drawings without inventive faculty.

FIG. 1 is an exploded view of the present utility model;

FIG. 2 is a layout of an electromagnetic coil in an embodiment of the utility model;

FIG. 3 is a layout of an electromagnetic coil in another embodiment of the present utility model;

FIG. 4 is a layout of a permanent magnet according to an embodiment of the present utility model;

FIGS. 5A-5D are layout diagrams of permanent magnets in another embodiment of the present utility model;

Fig. 6 is a structural view of a permanent magnet according to still another embodiment of the present utility model;

FIGS. 7A and 7B are block diagrams of a permanent magnet according to still another embodiment of the present utility model;

FIGS. 8A and 8B are schematic diagrams of locking mechanisms in some embodiments;

FIG. 8C is a schematic view of a resilient return member in a locking mechanism in some embodiments;

9A-9C are schematic diagrams of locking mechanisms in some embodiments;

Fig. 10A-10B are schematic diagrams of locking mechanisms in some embodiments.

The marks in the figure: the locking device comprises a protruding point component 1, a connecting rod 2, an electromagnetic coil 3, a metal pin 5, a permanent magnet 7, a limiting mechanism 8, a reset spring 9, a base 10, a locking block 11 in different embodiments of locking components I, 11a, 11b and 11c, a second clamping groove 110, a locking plate 12, a mounting plate 13, a first clamping groove 120, a locking component II121, a protruding part 121a, a friction block I121b, a friction block II121 c, a friction side I122a, a friction side II 122b, a limiting part 123, a tenon 124 and a guide curved surface 125, and a mosaic groove 20.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In this document, suffixes such as "module", "component", or "unit" used to represent elements are used only for facilitating the description of the present utility model, and have no particular meaning in themselves. Thus, "module," "component," or "unit" may be used in combination. The terms "upper," "lower," "inner," "outer," "front," "rear," "one end," "the other end," and the like herein refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The terms "mounted," "configured to," "connected," and the like, herein, are to be construed broadly as, for example, "connected," whether fixedly, detachably, or integrally connected, unless otherwise specifically defined and limited; the two components can be mechanically connected, can be directly connected or can be indirectly connected through an intermediate medium, and can be communicated with each other. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. Herein, "and/or" includes any and all combinations of one or more of the associated listed items. Herein, "plurality" means two or more, i.e., it includes two, three, four, five, etc.

When the three-dimensional coordinate system is constructed with the height direction of the braille display module as the Z axis, the length direction as the X axis, and the width direction as the Y axis, the "row" herein means that the direction extending in the length direction (i.e., extending in the X axis) of the braille display module is a row, and the "column" means that the direction extending in the width direction (i.e., extending in the Y axis) of the braille display module is a column. For example, two rows and three columns means that two rows of point display units are arranged in parallel along the width direction of the braille point display module, wherein three point display units are arranged in parallel along the length direction of the braille point display module in each row, see fig. 1.

As shown in fig. 1, the utility model provides a braille point display module capable of avoiding electromagnetic interference, which comprises six point display units arranged in a two-row and three-column mode, wherein each point display unit comprises a telescopic bump part 1 and a telescopic driving mechanism for driving the bump part 1 to stretch; the telescopic driving mechanism comprises a permanent magnet 7 arranged at the tail end of the salient point component 1 and an electromagnetic coil 3 (preferably, the electromagnetic coil is fixed in a base 10 or a shell of the Braille point display module) which interacts with the permanent magnet 7 to drive the permanent magnet 7 to move. In order to enable the bump part 1 to automatically reset under the condition of unloading force, a reset spring (not shown in the figure) for driving the bump part 1 to reset can be further arranged, and of course, when the bump part 1 is horizontally placed, the bump part 1 can also reset under the action of self gravity; when the bump parts 1 are in the contracted state, the permanent magnets 7 and the electromagnetic coils 3 corresponding to the same bump part 1 are on the same plane (namely, the arrangement structures of the electromagnetic coils and the permanent magnets are the same); and the electromagnetic coils 3 and the permanent magnets 7 of two adjacent point display units in the same row and the same column are staggered on the plane so as to form a multilayer arrangement structure.

By "out-of-plane" as used herein, it is meant that there is actually a difference in height between the planes of the plurality of parts (e.g., there is a difference in coordinate values in the Z-axis direction in a three-dimensional coordinate system). Electromagnetic interference is reduced by staggering the electromagnetic coils 3 of adjacent point display units in the same row (for example, the point display units in the second row and the point display units in the adjacent first row have height differences in a vertical plane or an XZ plane, and the point display units in the second row and the point display units in the adjacent third row also have height differences in the vertical plane or the XZ plane) and the electromagnetic coils 3 of the adjacent point display units in the same row on the plane (for example, the two point display units in the two rows and the second row have height differences in the vertical plane or the XZ plane). Because the permanent magnet 7 and the electromagnetic coil 3 of the same point display unit are arranged on the same plane, the permanent magnet 7 is staggered along with the electromagnetic coil 3 which is staggered in practice, and the electromagnetic interference between the adjacent point display units is further reduced. That is, "avoiding electromagnetic interference" herein actually means that electromagnetic interference can be reduced or reduced to some extent.

In addition, in the utility model, for the convenience of arrangement, the tail end of the bump part 1 is fixed with a connecting rod 2 coaxial with the bump part 1; the permanent magnet 7 is integrally fixed on the connecting rod 2, so that the permanent magnet and the bump parts are integrally arranged, and the permanent magnet, the connecting rod and the bump parts are integrally used as a rotor to perform synchronous movement. It is envisioned that the induction coil 3 should be sleeved outside the permanent magnet 7 so as to generate electromagnetic induction.

In practice, the arrangement of the electromagnetic coil 3 and the permanent magnet 7, which can make two adjacent point display units in the same row and the same column staggered on the plane, is various, and the core idea of the present utility model is illustrated by two specific embodiments, but the present utility model is not limited to the following two embodiments.

Example 1: as shown in fig. 2, in the present embodiment, the electromagnetic coils 3 of the six point display units are arranged in four layers of upper and lower layers: wherein the electromagnetic coil 3 corresponding to the first (or first column) and the third (or third column) point display units of the first row is positioned on the first layer at the top, the electromagnetic coil 3 corresponding to the second (or second column) point display units of the second row is positioned on the second layer, the electromagnetic coil 3 corresponding to the second (or second column) point display units of the first row is positioned on the third layer, and the electromagnetic coil 3 corresponding to the first (or first column) and the third (or third column) point display units of the second row is positioned on the fourth layer at the bottom.

In this embodiment, the two adjacent point display units in the same row and the same column are staggered on the plane, and the two rows of point display units are staggered in the height direction (i.e., the point display units in each layer are located in the same row, and the point display units in two adjacent layers are located in different rows) to form a four-layer structure, so that the height difference between the adjacent point display units in the same row is larger, and the interference between the adjacent point display units is further reduced. It is of course also possible to make a change over the four-layer structure described above, for example, it is also conceivable to interchange the two display units of the second and third layers.

Of course, the greater the distance of the misalignment between the electromagnetic coils 3, the less electromagnetic interference will be. However, due to space limitation, it is impossible to increase the staggered distance in the height direction without limitation, so in this embodiment, four layers of electromagnetic coils 3 are mutually connected from top to bottom in the height direction (for example, a certain distance exists between the plane where the bottom of the upper layer of electromagnetic coil is located and the plane where the top of the lower layer of electromagnetic coil is located), which can ensure no interference, and simultaneously, the structure of the whole device is compact, and the height of the whole device is not greatly increased.

In some embodiments, the permanent magnets 7 of the point display units are arranged in the height direction in accordance with the electromagnetic coils 3 used in the paired manner, that is, the electromagnetic coils 3 of the six point display units are also arranged in four layers from top to bottom, and the permanent magnets 7 on the first point display unit and the third point display unit of the first row are positioned on the first layer, the permanent magnets 7 on the second point display unit (or the second row) of the second row are positioned on the second layer, the permanent magnets 7 on the second point display unit (or the second row) of the first row are positioned on the third layer, and the permanent magnets 7 on the first point display unit and the third point display unit of the second row are positioned on the fourth layer.

In addition to the staggering in the height direction, the arrangement in the plane of the permanent magnets 7 is further improved in order to further reduce electromagnetic interference. As shown in fig. 4, in the present embodiment, the permanent magnets 7 on the two point display units in the second row are divided into four parts, and are respectively arranged on four sides of the connecting rod 2, that is, are oppositely arranged in pairs;

The permanent magnet 7 positioned on the two point display units of the first row is divided into three parts, which are respectively arranged on three sides of the connecting rod 2, and the side surface adjacent to the second row of point display units in the two point display units of the first row is vacant (i.e. the side surface is not provided with the permanent magnet 7);

Similarly, the permanent magnets 7 on the two point display units in the third row are divided into three parts, which are respectively arranged on three sides of the connecting rod 2, and the side surfaces of the connecting rod adjacent to the point display units in the second row are empty.

After the arrangement, the adjacent permanent magnets 7 are staggered in the height direction, and the adjacent permanent magnets 7 are staggered in planar arrangement, so that electromagnetic interference is reduced.

In this embodiment, three point display units in the same row form a delta structure in a vertical plane by using a height difference, and directions of the delta structures of two rows are opposite, so that a height difference exists between any point display unit and its adjacent point display unit in the X-axis direction (i.e., the adjacent point display unit in the same row) and its adjacent point display unit in the Y-axis direction (i.e., the adjacent point display unit in the same column).

Specifically, referring to fig. 1, insert grooves 20 may be respectively provided in four sides of the connection rod 2 corresponding to the positions of the fixedly disposed electromagnetic coils, and then permanent magnets 7 may be inserted into the insert grooves 20 and fixed to the connection rod by means of an adhesive or the like, thereby achieving the integrated disposition of the bump members 1, the connection rod 2 and the permanent magnets 7; of course, in order to improve the flexibility of the point display unit, for example, the position of the permanent magnet is adjusted according to the position of the electromagnetic limit of different positions, and a plurality of embedded grooves 20 may be provided at intervals along the height direction of the connecting rod 2.

Of course, in other embodiments, the permanent magnets on the point display unit may also be two parts, and accordingly, the planar arrangement (i.e. the distribution structure of the projections of the permanent magnets on the same horizontal plane on the horizontal plane) structure includes the following three manners:

(1) As shown in fig. 5A, the permanent magnets 7 on the same-column point display units are arranged in parallel; (2) As shown in fig. 5B and 5C, or the permanent magnets 7 on the point display units at both ends (i.e., in the first and third columns) are arranged in parallel, the permanent magnets 7 on the point display unit in the middle (i.e., in the second column) are perpendicular to the permanent magnets 7 on the point display units at both ends; (3) As shown in fig. 5D, the permanent magnets 7 on the two point display units of the first column are perpendicular to each other, the permanent magnets 7 on the two point display units of the third column are perpendicular to each other, the permanent magnets 7 on the two point display units of the second column are parallel to each other, and the permanent magnets on any one of the two point display units of the first column are parallel to each other.

Of course, in other embodiments, at least two inlay grooves may be disposed on two opposite sides of the connecting rod at intervals along the height direction thereof.

Example 2: as shown in fig. 3, this embodiment is different from embodiment 1 in that the electromagnetic coils 3 of six point display units are divided into two layers from top to bottom; wherein the electromagnetic coil 3 corresponding to the first (or first column) and the third (or third column) point display unit of the first row and the electromagnetic coil 3 corresponding to the second (or second column) point display unit of the second row are positioned on the first layer, and the electromagnetic coil 3 corresponding to the first (or first column) and the third (or third column) point display unit of the second row and the electromagnetic coil 3 corresponding to the second (or second column) point display unit of the first row are positioned on the second layer. The arrangement further makes the device more compact, for example in application scenarios where a further miniaturization is required, with a reduced amount of electromagnetic interference, this embodiment being selectable.

In this embodiment, the point display units adjacent to the same row and the same column are staggered on the plane, and the two rows of point display units are arranged in a cross manner or in a mixed manner in the height direction (i.e., the same layer includes the point display units located in different rows), so that a height difference exists between the adjacent point display units in the same row, and meanwhile, a height difference exists between the two point display units in the same column, thereby reducing the interference between the adjacent point display units.

Similarly, the permanent magnet 7 on each point display unit is arranged in the height direction in accordance with the electromagnetic coils 3 used in the matching manner, namely, the electromagnetic coils 3 of the six point display units are also arranged in an upper layer and a lower layer, and the permanent magnet 7 on the first point display unit and the third point display unit of the first row and the permanent magnet 7 on the second point display unit of the second row are positioned on the first layer, and the permanent magnet 7 on the first point display unit and the third point display unit of the second row and the permanent magnet 7 on the second point display unit of the first row are positioned on the second layer.

In some embodiments, the number of electromagnetic coils and permanent magnets in the same layer is increased due to the reduction of the distribution level of the electromagnetic coils, so that the number of permanent magnets on each point display unit is reduced for reducing interference. For example, the permanent magnet on each point display unit is divided into two parts, and two opposite side surfaces of the connecting rod 2 are respectively arranged, namely the two parts of permanent magnets on each point display unit are oppositely arranged in parallel; whereas in a planar arrangement (i.e. a distribution structure of projections of the permanent magnets on the same horizontal plane) this embodiment comprises the following three ways: (1) As shown in fig. 5A, the permanent magnets 7 on the same-column point display units are arranged in parallel; (2) As shown in fig. 5B and 5C, the permanent magnets 7 on the point display units at the two ends (i.e., the first column and the third column) are arranged in parallel, and the permanent magnets 7 on the point display unit in the middle (i.e., the second column) are perpendicular to the permanent magnets 7 on the point display units at the two ends; (3) As shown in fig. 5D, the permanent magnets 7 on the two point display units of the first column are perpendicular to each other, the permanent magnets 7 on the two point display units of the third column are perpendicular to each other, the permanent magnets 7 on the two point display units of the second column are parallel to each other, and the permanent magnets on any one of the two point display units of the first column are parallel to each other.

In some embodiments, when the permanent magnets of the six display units are in a double-layer structure, three point display units shown by three dotted frames in fig. 5A are located on the same layer, and the projections of the central lines Q1, Q2, Q3 of the permanent magnets 7 on the three point display units on the same layer on the horizontal plane overlap with the projections of the central lines Q4 of the respective corresponding electromagnetic coils (or symmetry axes extending along the Y-axis direction on the cross section of the electromagnetic coils) on the horizontal plane, see fig. 5A.

In other embodiments, in order to further reduce electromagnetic interference, the permanent magnets 7 on the three point display units of the same layer are arranged in a plane eccentric structure, that is, the projections of the central lines Q1', Q3' of the two parallel permanent magnets 7 on the point display units of the first column and the third column are not overlapped with the projections of the central lines Q4 of the corresponding electromagnetic coils on the horizontal plane, see fig. 5A.

Preferably, the center lines Q1', Q3' of the two permanent magnets 7 on the point display units of the first and third columns in the same layer are each moved in a direction away from the point display units of the second column, i.e., the distance between the center lines of the point display units of the first and third columns and the center line Q2 of the point display unit of the second column increases, see fig. 5A; or the distance from the center line Q4 of the electromagnetic coil of the second column of the point display unit increases, see fig. 5B. Similarly, the permanent magnets on the point display units at both ends in the same layer in fig. 5C and 5D can also be moved in a direction away from the middle point display unit, thereby increasing the distance between the permanent magnets.

Of course, the permanent magnets on the point display unit in this embodiment may also be four parts, and the arrangement thereof is as shown in fig. 3, or the arrangement described in embodiment 1.

In order to make the structure compact in embodiment 1 and embodiment 2, the number of turns of the electromagnetic coil 3 and the volume of the permanent magnet 7 are reduced. In order to ensure that the bump mechanism is driven to the extended state by enough electromagnetic induction, the bump mechanism can be provided with enough acting force by increasing current.

Of course, the effect of increasing electromagnetic induction can also be achieved by improving the structure of the permanent magnet 7, for example, the following two embodiments.

Example 3: as shown in fig. 6, the permanent magnet 7 is cylindrical and is fitted over the connecting rod 2 on the premise of adopting the arrangement of embodiment 1 or embodiment 2. Of course, the electromagnetic coil 3 is also provided in a matched cylindrical shape, and by increasing the size of the permanent magnet 7 to increase the magnetic force, the stability during operation can be increased.

Example 4: as shown in fig. 7A and 7B, unlike embodiment 3, the permanent magnet 7 in this embodiment has left and right parts each having a rectangular cross section; the two opposing faces of the left and right permanent magnets 7 are bonded and then integrally bonded to the connecting rod 2, and in this state, the volume of the permanent magnet 7 is maximized, so this embodiment is an embodiment of magnetic force maximization.

Most of the prior point displays have two structures, namely a driving part and a convex point, for example, a linear cam structure is utilized, the lifting of the connecting rod is controlled by a convex structure to a groove in the middle of the connecting rod, and when the convex structure leaves the groove, the convex point descends by self gravity. However, the design is complex in structure, the components are worn to different degrees, the protruding structure can provide lateral force for the protruding points when moving towards the grooves, friction between the protruding points and the boundary is increased, and reliability of the product cannot be guaranteed. Therefore, compared with the traditional method, the embodiment adopts an integrated design mode, and mainly has the advantages that the structure is simplified greatly, the installation and the test are very convenient, the structure is used as a driving force by means of magnetic field force, the salient points only bear upward force, no horizontal force exists, the resistance of the salient point in the rising process is reduced, and the salient points are easier to rise.

In order to achieve the purpose that the salient point component 1 can still be kept in the extending state when the power is removed, the Braille point display module further comprises a locking mechanism for locking the salient point components 1 in the six point display units in the extending state.

Specifically, the locking mechanism comprises a locking part I11 fixed with the bump part 1, a translatable locking plate 12, a driving mechanism (not shown in the figure) for driving the locking plate 12 to translate, and an elastic reset part for driving the locking plate 12 to reset; the locking plate 12 is provided with a corresponding locking part II121 corresponding to the locking part I11 on each point display unit;

When the locking plate 12 translates, the locking part II121 is driven to act on the locking part I11, so that the bump part 1 is locked in the extended state.

In some embodiments, the drive mechanism is a memory metal wire, e.g., a memory alloy wire (preferably, the memory metal is nitinol); the length of the memory wire is shortened when the memory wire is energized, thereby driving the locking plate 12 to move in the first direction; when it is powered off, the locking plate 12 is driven to move in a second direction (relative to the first direction) by the elastic restoring member 9, thereby restoring the length of the memory wire. Specifically, one end of the memory wire is connected to the mounting plate 13, and the other end is connected to the locking plate 12.

Further, a return spring 9 may be provided as an elastic return member so that the auxiliary locking plate 12 is returned under the condition that the memory wire is powered off.

In some embodiments, the return spring 9 adopts a serpentine structure formed by bending steel sheets in the same plane (thus reducing the volume of the return spring 9, facilitating arrangement and reducing the volume of the whole unit), and increasing the arrangement length in a limited space, see fig. 8c; and the axial direction of the return spring 9 is perpendicular to the translational direction of the locking plate 12.

Preferably, the return spring 9 is disposed transversely (both ends of which are fixed to the base), that is, the axial direction of the return spring 9 is perpendicular to the axial direction of the locking plate 12 (i.e., the length direction of the locking plate 12); and the locking plate 12 passes through the middle of the return spring 9, see fig. 8c, correspondingly, first clamping grooves 120 which can be matched with the return spring 9 are symmetrically arranged on two sides of the locking plate 12, so that the restoring force generated by the return spring 9 is opposite to the translation direction of the locking plate 12.

In the present utility model, three specific embodiments of the locking member I and the locking member II are provided, and the present utility model is not limited to the three examples as well.

Example 5: as shown in fig. 8A and 8B, in this embodiment, the locking member I11 is a locking block 11a fixedly connected to the connecting rod 2 of the bump member 1, and the locking member II121 is a side flap or protrusion 121a provided on the side of the locking plate 12 (preferably, the protrusion is formed by extending two sides of the locking plate in a direction perpendicular to the axis O2 thereof);

Referring to fig. 8A, in the initial state, the memory wire is in the unpowered state, which is in the original length, and at this time, the protrusion 121a on the locking plate 12 is engaged with the second clamping groove 110 in the above-mentioned locking block 11a, thereby locking the corresponding bump member 1 in the contracted state;

When the memory wire is energized, it shortens and drives the locking plate 12 so that the protruding part 121a on the locking plate 12 exits the second clamping groove 110, thereby unlocking the bump part 1 and making it convenient to lift/extend; and is also provided with

When the bump member 1 at the corresponding position is lifted, the memory wire is again powered off to restore the original length (or is quickly restored with the aid of the elastic restoring member), at this time, the protrusion 121a on the locking plate 12 moves to the bottom of the second clamping groove 110, that is, the protrusion 121a moves to the bottom of the locking member I11 under the driving of the locking plate 12, so as to lock the bump member 1 in the extended state, preventing it from falling back, see fig. 8B.

In this embodiment, the length of the memory wire is shortened when the drive mechanism is energized, and the locking plate 12 is pulled to make the protruding part on the locking plate 12 staggered with the locking block, so that the bump member 1 can move up and down freely. When the bump part 1 is in the extended state, the memory wire is powered off again to restore to the normal state, and the locking plate 12 is reset accordingly, so that the protruding part 121a is padded at the bottom of the locking block 11a to prevent the bump part 1 from falling back.

Of course, in the present embodiment, the above-described protrusion 121a is provided at a position on the locking plate 12 corresponding to each bump member, so that locking of the extended state or the contracted state of at least one of the point display units in the entire point display module can be simultaneously achieved by the locking plate 12.

Example 6: as shown in fig. 9A, 9B, 9C, the locking member I11 and the locking member II121 each include a friction side surface. Specifically, referring to fig. 9A, the locking member II121 includes a friction block I121b provided at the locking plate 12, the friction block I being provided with a friction side face I122a at a side corresponding to the locking member I11. Specifically, the friction block I121b is formed such that both sides of the locking plate extend in a direction perpendicular to the axis O2 thereof (i.e., extend in a direction along the Y-axis and away from the locking plate) and extend upward in a direction perpendicular to the axis O2 (i.e., extend in the Z-axis).

In the initial state, the memory wire is in the unpowered state, which is in the original length, and at this time, the friction side face I122a of the protruding portion on the lock plate 12 is engaged with the friction side face II122b on the above-described lock block 11b (preferably, the friction side face II122b on the lock block 11b extends in the vertical direction to a height greater than the friction side face I122a on the protruding portion 121a extends in the vertical direction), so that the corresponding bump member is locked in the contracted state;

When the memory wire is electrified, the memory wire is shortened, and the locking plate 12 is driven to move along the direction away from the locking block 11b, so that the friction side surfaces of the memory wire and the locking block are separated, and the bump part 1 is unlocked, so that the bump part is convenient to lift/extend; and is also provided with

When the bump member 1 at the corresponding position is lifted, the memory wire is again de-energized to restore the original length (or is quickly restored with the aid of the elastic restoring member), and at this time, the friction side surface I122a on the locking plate 12 is in contact with the friction side surface II122b on the locking block 11b to generate a static friction force, so that the bump member 1 is locked in the extended state.

In this embodiment, the length of the driving mechanism, i.e., the memory wire, is shortened when energized, and the locking plate 12 is pulled to separate the friction side face I122a of the locking member II121 from the friction side face II122b of the locking member I11, so that the bump member 1 can freely move up and down. When the bump part 1 is in the extended state, the memory wire is powered off and returns to normal state, and the friction side surface I122a of the locking part II121 and the friction side surface II122b on the locking part I11 are contacted to generate static friction force to prevent the bump part 1 from falling back.

Further, in order to increase the friction force, the friction side surface can be adjusted in terms of material and shape, for example, a rubber friction side surface is provided and an anti-skid groove, an anti-skid grain and the like are provided.

Further, a stopper 123 is provided on the top of the friction side face II122b of the lock block 11 b. Further, the friction side surface I122a is provided on top with a guide curved surface 125 for guiding the friction side surface II122 b.

Example 7: as shown in fig. 10A and 10B, locking members I11 and II121 are provided with locking tenons and mortises, respectively. In the initial state, the memory wire is in the unpowered state, which is in its original length, and at this time, the rabbet 124 on the friction block II121c on the lock plate 12 is inserted into the mortise, thereby locking the bump member 1 in the contracted state,

When the memory wire is electrified, the memory wire is shortened, and the locking plate 12 is driven to move along the direction away from the locking block 11c, so that the tenon 124 on the locking plate 12 and the tenon groove on the locking block 11c are separated, the bump part 1 can freely stretch up and down, and after the bump part 1 stretches out, the memory wire is powered off, the locking plate is reset under the action of the reset spring 9, and at the moment, the tenon 124 moves to the bottom of the locking block 11c under the driving of the locking plate 12, so that the bump part 1 is locked in a stretching state.

In this embodiment, the length of the drive mechanism, i.e., the memory wire, is shortened when energized, and the locking plate 12 is pulled to separate the tenon 124 on the locking member II121 from the mortise on the locking member I11 (of course, in other embodiments, the positions of the tenon and the mortise may be interchanged), so that the bump member 1 can freely move up and down. When the bump part 1 is in the extended state, the memory metal wire is powered off and reset, and the tenon on the locking part II121 butts against the bottom of the mortise on the locking part I11 to prevent the bump part 1 from falling back.

In addition, the utility model also provides a Braille display for avoiding electromagnetic interference, which comprises a module array consisting of a plurality of Braille point display modules, wherein the row spacing between the module arrays is smaller than 5mm.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The embodiments of the present utility model have been described above with reference to the accompanying drawings, but the present utility model is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present utility model and the scope of the claims, which are to be protected by the present utility model.

Claims

1. The utility model provides a friction type locking mechanism of braille point display module which characterized in that includes: the locking component I is arranged at the bottom of each point display unit in the Braille point display module, the locking plate can translate, the driving mechanism is used for driving the locking plate to move, and the elastic reset piece is used for driving the locking plate to reset; the locking plate is provided with a plurality of locking parts II which can be respectively matched with the locking parts I to lock the salient point parts of the corresponding point display units in an extending state or a shrinking state; the driving mechanism adopts a memory metal wire; wherein the locking part I comprises a first friction side surface, and the locking part II comprises a second friction side surface which can be contacted with the first friction side surface to generate friction force;

When in an initial state, the memory metal wire is in a power-off state, and the first friction side surface and the second friction side surface are in contact so as to lock the bump component in a contracted state;

When the memory metal wire is electrified, the memory metal wire drives the locking plate to move, so that the salient point component is unlocked when the first friction side surface is separated from the second friction side surface;

2. The friction locking mechanism of claim 1 wherein: and the second friction side surface is provided with anti-skid lines for increasing friction force.

3. The friction locking mechanism of claim 2 wherein: and a limiting part is arranged above the first friction side surface.

4. A friction locking mechanism according to any one of claims 1 to 3, wherein: the point display unit comprises a telescopic bump part, a connecting rod coaxial with the bump part is fixed at the tail end of the bump part, the locking part I is a locking block arranged at the tail part of the connecting rod, and the first friction side surface is arranged on the side wall, close to the locking part II, of the locking block;

The locking part II is a protruding part arranged on two sides of the locking plate, and the second friction side face is arranged on the side wall, close to the locking block, of the protruding part.

5. The friction locking mechanism of claim 4, wherein: the protruding part is also provided with a guiding curved surface used for guiding the first friction side surface to be contacted with the second friction side surface, and the guiding curved surface is arranged at the top of the second friction side surface.

6. The friction locking mechanism of claim 4, wherein: the length of the first friction side is greater than the length of the second friction side.

7. The friction locking mechanism of claim 1 wherein: the elastic reset piece adopts a reset spring formed by bending a steel sheet in the same plane, and the axial direction of the reset spring is perpendicular to the translation direction of the locking plate.

8. A friction locking mechanism as set forth in claim 7 wherein: the Braille point display module comprises six point display units which are arranged in a two-row and three-column mode, wherein each point display unit comprises a telescopic bump part and a telescopic driving mechanism for driving the bump part to stretch and retract, and the tail end of the bump part is fixed with a connecting rod coaxial with the bump part; the telescopic driving mechanism comprises a permanent magnet integrally arranged on the connecting rod and an electromagnetic coil which interacts with the permanent magnet to drive the permanent magnet to move;

9. The friction locking mechanism of claim 8, wherein: the point display units of the first row and the third row in one row are positioned on the same horizontal plane with the point display units of the second row in the other row, so that six point display units are in a double-layer structure.

10. The friction locking mechanism of claim 8, wherein: wherein the first and third rows of point display units and the second row of point display units in one row are distributed on a first horizontal plane and a second horizontal plane; the point display units of the second row and the first and third rows of point display units are respectively positioned on a third horizontal plane and a fourth horizontal plane, wherein the heights of the first horizontal plane, the second horizontal plane, the third horizontal plane and the fourth horizontal plane are sequentially reduced, so that six point display units are in a four-layer structure from top to bottom.