Braille printing device

Abstract

The invention provides a braille printing device, and relates to the field of printing devices. The laser array module is composed of N * M lasers, and each laser can be independently controlled and is used for emitting laser beams to selectively heat a heat-sensitive material; the heat-sensitive material module is positioned below the laser array module and is used for receiving the laser beams and generating corresponding physical or chemical changes; the data processing module is used for receiving the braille alphabet data and converting the received braille alphabet data into a laser dot matrix instruction of a braille alphabet dot matrix; the control module is used for accurately controlling the on-off state and power output of each laser in the laser array module according to the laser dot matrix instruction; the control module further comprises a salient point quality control unit and a laser focus quality control unit; the salient point quality control unit comprises an optical sensor for detecting the height of the braille salient point; the laser focus quality control unit comprises an imaging sensor used for detecting the focus position of each laser beam.

Description

Technical Field

[0001] The present invention relates to the field of printing devices, and more specifically, to a Braille printing device. Background Art

[0002] Braille, commonly known as "dot writing" or "raised writing", was invented by the Frenchman Louis Braille in 1824 and is a kind of writing that relies on tactile perception. There are approximately 1,000 to 2,000 Braille raised dots on one page of a Braille book. The basic unit of Braille is a Braille cell or Braille symbol. Each Braille cell has 6 dot positions, which are distributed in a matrix of three rows and two columns. Different Braille cells are represented according to whether there are raised dots at the corresponding positions. Braille cells are arranged according to the "National Braille Standard" at a certain dot pitch and line pitch to form Braille.

[0003] Currently, the number of circulating Braille books is still small and cannot meet the reading needs of blind friends. One reason is that existing Braille printers mostly adopt a word-by-word printing mode, where a single or multiple needles sequentially strike the paper to form Braille dots. However, this technology has problems such as low efficiency, high mechanical complexity, and material waste. The word-by-word printing speed is slow and it is difficult to meet the large-scale Braille printing requirements (such as textbooks, public signs, etc.). Moreover, the frequent movement of the needles easily causes mechanical wear and the maintenance cost is relatively high. At the same time, line-by-line printing requires repeated adjustment of the paper position, which easily causes positioning errors and material losses. Although the closest prior art is a multi-needle Braille printer, it is still limited to single-line or small-scale parallel printing (usually only supporting dozens of cells in a single line) and cannot achieve large-scale parallel output. For example: the patent "An electromagnetic drive type Braille display device" with the application number 202210934947.4, its printing efficiency is limited by mechanical movement and it cannot achieve high-speed printing and non-contact printing. The patent "A portable electromagnetic dot matrix Braille sticky note printing device" with the application number 201911089280.7 is mainly suitable for small-format Braille printing such as sticky notes and cannot meet the Braille printing requirements of larger formats such as textbooks and books. The above printers are all based on electromagnetic drive and have obvious limitations. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. For this reason, the present invention provides a Braille printing device; the present invention can combine a Braille printing solution with high-speed printing, non-contact technology, and large-scale parallel output to overcome the deficiencies of the prior art.

[0005] The first aspect of the present application discloses a Braille printing device, which includes:

[0006] A laser array module: composed of N*M lasers, each laser can be independently controlled, and is used to emit light beams to selectively heat the thermosensitive material; N and M are both natural numbers greater than or equal to 1;

[0007] Thermal material module: Located below the laser array module, it is used to receive the light beam and generate corresponding physical or chemical changes;

[0008] Data processing module: It is used to receive braille data and convert the received braille data into laser dot matrix instructions for braille dot matrix;

[0009] Control module: According to the laser dot matrix instructions, it precisely controls the on / off state and power output of each laser in the laser array module; The control module also includes a bump quality control unit and a laser focus quality control unit; The bump quality control unit includes an optical sensor for detecting the height of braille bumps; The laser focus quality control unit includes an imaging sensor for detecting the position of the focus of each laser beam.

[0010] In some embodiments, the number of laser array modules is any one or several of 1 - 864; N is any one or several of 1 - 27, and M is any one or several of 1 - 32.

[0011] In some embodiments, a single laser array module includes 6 laser dots in 3 rows * 2 columns; Each laser dot is independently controlled by a drive circuit for forming bumps. The arrangement of laser dots within a single laser array module includes: the dot pitch is 2.2 - 2.8 mm, preferably 2.5 mm;

[0012] In some embodiments, the laser is a laser diode or a vertical cavity surface emitting laser to ensure that the position error of each laser in the high - density laser array is extremely small.

[0013] In some embodiments, the device further includes a microlens corresponding to each laser, and the optical axis of the microlens is precisely aligned with the light - emitting center of the laser to ensure that the light beam can be collimated in the best state through the microlens. The microlens uses a silicon - based microlens to achieve beam collimation and ensure that the focus of each laser beam precisely falls on the target position. Optionally, the microlens and the laser chip are integrally packaged to reduce assembly errors.

[0014] In some embodiments, the device further includes a high - thermal - conductivity material substrate, and a micro heat sink or a micro thermoelectric cooling module (TEC), such as an aluminum nitride substrate, is provided on the back of the high - thermal - conductivity material substrate.

[0015] In some embodiments, the device further includes a mechanical transmission module responsible for the movement and positioning of the material to ensure that the light beam can be heated at the correct position.

[0016] In some embodiments, converting the received Braille data into a laser dot matrix instruction for a Braille dot matrix includes: obtaining the convex dot position coordinates corresponding to the Braille data according to the Braille data arrangement; generating and sending a control instruction to a control module according to the convex dot position coordinates; and the control module providing a conduction signal to a switch corresponding to a laser point in a control laser module according to the control instruction, thereby controlling the corresponding switch to open.

[0017] The second aspect of the present application discloses a Braille printing method, which is applied to the Braille printing device of the first aspect of the present application. The Braille printing method comprises:

[0018] S101, obtaining Braille data;

[0019] S102, converting the corresponding convex dot position coordinates in the Braille data into laser dot matrix instructions of the Braille dot matrix;

[0020] S103, generating and issuing corresponding control instructions according to the laser dot matrix instruction, so that the point positions of the thermosensitive material corresponding to the laser dots are raised.

[0021] The present application has the following beneficial effects: 1. The present application innovatively discloses a non-contact Braille printing device, which uses a miniaturized laser array to irradiate the thermosensitive material pre-coated with a thermal expansion layer with a short-time, low-energy infrared laser, so that the microcapsules of the coating are locally heated and expanded, thereby forming convex points. Each laser point works independently, and the array control system selectively activates the laser point according to the input data to form the target Braille.

[0022] 2. Efficiency leap. The printing volume is large and high-speed, and 864 square Braille printing can be completed in a single time, which is much faster than the mechanical needle.

[0023] 3. Zero mechanical wear. Completely eliminate mechanical wear problems, non-contact printing, and significantly extend the life of the equipment.

[0024] 4. High precision and consistency. Ultra-high precision, high laser positioning accuracy, and laser energy closed-loop control ensure low bump height error.

[0025] 5. Low cost. Micro lasers and standard thermal materials reduce overall costs.

[0026] 6. Environmentally friendly. No noise, low energy consumption, suitable for a variety of scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0028] Figure 1 is a structural block diagram of a printing device provided by an embodiment of the present invention;

[0029] Figure 2 is a layout diagram of a laser array provided by an embodiment of the present invention;

[0030] Figure 3 is a diagram of the arrangement mode of the laser array provided by an embodiment of the present invention. Specific Embodiments

[0031] In order to enable those skilled in the art to better understand the solutions of the present invention, the following clearly and completely describes the technical solutions in the embodiments of the present invention through specific specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Without conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0032] In some processes described in the specification, claims and the above accompanying drawings of the present invention, there are multiple operations that appear in a specific order. However, it should be clearly understood that these operations can be executed not in the order in which they appear in this article or in parallel. The serial numbers of the operations, such as 101, 102, etc., are only used to distinguish different operations, and the serial numbers themselves do not represent any execution order. In addition, these processes can include more or fewer operations, and these operations can be executed in sequence or in parallel. It should be noted that the descriptions such as "first" and "second" in this article are used to distinguish different messages, devices, modules, etc., and do not represent a sequence, nor do they limit that "first" and "second" are of different types.

[0033] As Figure 1 shown, in the first aspect of the present application, a braille printing device is disclosed. The device includes: a laser array module: composed of N*M (N rows and M columns) lasers, each laser can be independently controlled, and is used to emit a light beam to selectively heat the thermosensitive material; both N and M are natural numbers greater than or equal to 1.

[0034] Thermal material module: Located below the laser array module, it contains a thermal material that can respond to laser heating, and is used to receive the light beam and generate corresponding physical or chemical changes; Data processing module: It is used to receive braille data and convert the received braille data into laser dot matrix instructions for braille dot matrix; Control module: It precisely controls the on / off state and power output of each laser in the laser array module according to the laser dot matrix instructions; The control module also includes a bump quality control unit and a laser focus quality control unit; The bump quality control unit includes an optical sensor for detecting the height of braille bumps; The laser focus quality control unit includes an imaging sensor for detecting the position of the focus of each laser beam. Among them, the function of the laser array module is: The laser, as the core energy source, can emit a laser beam with a high energy density, which is used to precisely heat the special material for braille. The characteristics of the laser array module are: The laser has high directivity, monochromaticity, and energy concentration, and can achieve precise temperature control, so as to form a tiny high-temperature area on the special material for braille. The function of the thermal material module: The thermal material is the carrier of braille printing, usually a special coating material, which will undergo physical or chemical changes after laser heating to form raised braille dots. The characteristics of the thermal material module: The thermal material needs to have high sensitivity and durability to ensure the clarity and persistence of braille dots. The standard height of braille bumps is between 0.2 - 0.5 mm; The laser focus quality control unit includes a CMOS imaging sensor for detecting the position of the focus of each laser beam. If an offset is found, the software automatically performs compensation adjustment. The laser focus quality control unit real-time feedback adjusts the pulse width, power, and focus position of each laser point, and adopts a dynamic energy regulation mechanism during the printing process to ensure the printing accuracy.

[0035] In some more specific embodiments, the control module is used to control the energy output of the laser, the movement of the thermal material, and the printing process, and generally includes an input interface (such as USB, Bluetooth) and data processing software.

[0036] In some embodiments, the laser focus quality control unit also includes a laser interference laser ranging sensor for measuring the paper thickness to dynamically adjust the laser focal length to ensure that the focus is always located on the optimal focal plane of the thermal material, and a humidity sensor for detecting the paper humidity. In some more specific embodiments, the thermal material is braille paper.

[0037] In some embodiments, the number of laser array modules is any one or several of 1 - 864; N is any one or several of 1 - 27, and M is any one or several of 1 - 32.

[0038] In some embodiments, a single laser array module includes 6 laser points arranged in 3 rows * 2 columns; Each laser point is independently controlled by a driving circuit and is used to form bumps. The arrangement of laser points within a single laser array module includes: The dot pitch is 2.2 - 2.8 mm, preferably 2.5 mm.

[0039] In some embodiments, when M is greater than 1, the square pitch between adjacent laser array modules on the left and right is 3.5 - 4 mm, preferably 4 mm; when N is greater than 1, the row pitch between adjacent laser array modules above and below is ≥5 mm, preferably 5 mm; in some more specific embodiments, when N is 1 and M is 1, the number of laser array modules is 1*1 = 1, and the corresponding number of laser spots is 6; when N is 1 and M is 32, the number of laser array modules is 1*32 = 32, and the corresponding number of laser spots is 192; when N is 2 and M is 32, the number of laser array modules is 2*32 = 64, and the corresponding number of laser spots is 384; when N is 27 and M is 32, the number of laser array modules is 27*32 = 864, and the corresponding number of laser spots is 5184. As Figure 2 and Figure 3 shown.

[0040] In some embodiments, the laser is a laser diode or a vertical cavity surface emitting laser to ensure that in a high-density laser array, the position error of each laser is extremely small. A laser array is a laser formed by arranging multiple laser emission points. The core is a laser made of semiconductor materials (such as gallium arsenide), and laser output is achieved through current injection. A VCSEL (vertical cavity surface emitting laser) array is a monolithic array composed of multiple VCSEL units, which can be a linear or two-dimensional structure. Each VCSEL unit outputs a circular beam through a vertical cavity structure and supports high-speed modulation, making it suitable for short-distance high-speed data communication and optical sensors.

[0041] Among them, the VCSEL array consists of the following core parts: VCSEL unit: Each unit is a vertical cavity surface emitting laser with the following characteristics: Vertical cavity structure: It consists of two distributed Bragg reflectors (DBRs) on the top and bottom and an active layer in the middle, forming an optical resonant cavity. Circular beam output: Compared with edge-emitting lasers, the output beam of VCSEL is more symmetrical, facilitating coupling. High-speed modulation ability: Supports gigabit-level data transmission. Array form: Multiple VCSEL units are integrated on a single substrate to form a one-dimensional or two-dimensional array, facilitating high-density light emission. Material: Usually made of semiconductor materials such as gallium arsenide (GaAs) to ensure efficient photoelectric conversion and stability.

[0042] In some embodiments, the device further includes microlenses corresponding to the lasers one by one. The optical axis of the microlens is precisely aligned with the light-emitting center of the laser to ensure that the light beam can be collimated through the microlens in an optimal state. The microlens adopts a silicon-based microlens to achieve light beam collimation and ensure that the focus of each laser beam precisely falls on the target position. Optionally, the microlens and the laser chip are integrally packaged to reduce assembly errors. Among them, the main function of the microlens is to correct the divergence angle of the light beam and convert the divergent light beam into a parallel light beam (collimated light beam), which helps to improve the directivity and focusing performance of the light beam, thereby enhancing the printing accuracy and efficiency. The diode is the emission source of the light beam. Usually, the divergence angles of the diode in the fast axis (perpendicular to the light-emitting surface) and slow axis (parallel to the light-emitting surface) directions are very different, so compensation is required through the microlens. The positional relationship between the microlens and the diode: Relative position: The microlens is usually installed in front of the light-emitting hole of the laser and is bonded by optical glue or fixed by precision machinery to ensure that the light beam can directly pass through the microlens after emitting from the diode. The optical axis of the microlens needs to be precisely aligned with the light-emitting center of the laser to ensure that the light beam can be collimated through the microlens in an optimal state. Key parameters: Focal length: The focal length of the microlens needs to be selected according to the divergence angle of the diode. For the fast axis direction (with a larger divergence angle), the focal length of the microlens is shorter; for the slow axis direction (with a smaller divergence angle), the focal length of the microlens is longer. Numerical aperture (NA): The numerical aperture of the microlens needs to match the characteristics of the diode light beam to ensure that the light beam can be effectively collimated. Lens shape: The shape of the microlens (such as a cylindrical microlens or a spherical microlens) also affects the collimation effect of the light beam. Usually, a cylindrical microlens is used to compensate for the divergence angle difference between the fast axis and the slow axis.

[0043] In some embodiments, the device further includes a high thermal conductivity material substrate. A micro heat sink or a micro thermoelectric cooling module (TEC), such as an aluminum nitride substrate, is provided on the back of the high thermal conductivity material substrate. The definition of the laser array: A set composed of multiple laser emission units, which is used to precisely control the light beam distribution and energy output during the printing process. The definition of the substrate: The underlying material used to carry printing materials (such as inks, inks, or functional materials) during the printing process, and its characteristics directly affect the printing effect. The specific positional relationship between the laser array and the substrate: Relative position: The laser array is usually located at the upper part or side of the printing device, and the light beam is focused on the surface of the substrate through an optical system (such as lenses, mirrors, etc.). The substrate is fixed on the printing platform or substrate bracket and is located below or opposite the laser array to ensure that the light beam can precisely irradiate the designated position on the substrate. Influence of the positional relationship: The distance between the laser array and the substrate needs to be precisely calibrated to ensure that the light beam can be focused on the surface of the substrate and avoid light beam diffusion or energy loss caused by improper distance. The levelness and stability of the substrate directly affect the printing accuracy. If the substrate is uneven or moves, it will cause the printed pattern to be distorted or blurred.

[0044] In some embodiments, the device further includes a mechanical drive module responsible for the movement and positioning of materials to ensure that the laser beam can heat at the correct position. The mechanical drive module generally consists of a stepper motor, a guide rail, a transmission belt, etc., and can achieve high-precision positioning and movement.

[0045] In some embodiments, the laser dot matrix instructions for converting the received braille data into a braille dot matrix include: obtaining the position coordinates of the raised dot positions corresponding to the braille data according to the braille data layout; generating and sending a control instruction to the control module according to the position coordinates of the raised dot positions; and the control module providing a conduction signal to the switch corresponding to the laser dot in the control laser module according to the control instruction to control the corresponding switch to open.

[0046] In some embodiments, the device further includes a camera for obtaining image information and / or a microphone for obtaining voice information.

[0047] The second aspect of the present application discloses a braille printing method. The braille printing method is applied to the braille printing device in the first aspect of the present application. The braille printing method includes:

[0048] S101, obtaining braille data; obtaining braille data includes: obtaining image information through a camera and / or obtaining voice information through a microphone.

[0049] S102, converting it into laser dot matrix instructions for a braille dot matrix according to the position coordinates of the corresponding raised dot positions in the braille data;

[0050] S103, generating and sending a corresponding control instruction according to the laser dot matrix instructions to make the positions corresponding to the laser dots on the thermosensitive material bulge. Specific embodiments:

[0052] 1. Multi-beam laser array design. As Figure 2 shown, a miniaturized laser array (81×64 matrix, 27 rows×32 squares, a total of 5184 laser dots) is adopted. Each laser dot is independently controllable and is used to form raised dots, and an 864-square braille array can be formed at one time. The laser wavelength is selected in the infrared band to match the thermosensitive coating material (microcapsule thermal expansion layer), and only short-time low-energy irradiation is required to trigger local expansion to form raised dots.

[0053] (1) Arrangement method: 81×64 matrix arrangement. The array contains 64 columns, with 81 lasers in each column, for a total of 5184 laser dots. Since the size parameters of the braille characters require a dot pitch of 2.2 - 2.8 mm, a square pitch of 3.5 - 4 mm, and a line pitch of ≥5 mm, the spacing design between the lasers is as Figure 2 shown, with a dot pitch of 2.5 mm, a square pitch of 4 mm, and a line pitch of 5 mm.

[0054] Each laser array is a module (6 laser points form a module), and the laser points within each module have independent control and drive circuits. VCSEL (Vertical Cavity Surface Emitting Laser) is used as the laser light source because of its advantages such as planarization, easy arraying, low power consumption, and low heat generation. The VCSEL array can be directly integrated on the chip, making the layout more compact.

[0055] (2) Difficulties overcome during miniaturization ① When manufacturing a high-density laser array, it is necessary to ensure that the position error of each laser is extremely small; semiconductor lithography and MEMS processes are used to manufacture the VCSEL array to ensure the high precision of the array.

[0056] ② High-density arrangement is likely to cause light beam scattering or overlap. By using a silicon-based microlens array, beam collimation is achieved to ensure that the focus of each laser beam precisely falls on the target position. The microlenses correspond one-to-one with the lasers and are integrally packaged with the laser chip to reduce assembly errors.

[0057] ③ High-density lasers generate heat during operation, increasing the difficulty of heat dissipation in the miniaturization design. A high thermal conductivity material (aluminum nitride substrate) is used as the base of the laser array. Miniature heat sinks or miniature thermoelectric cooling modules (TEC) are designed on the back of the array, combining active and passive heat dissipation technologies.

[0058] ④ Laser focus shift affects printing accuracy, and real-time detection and correction are required. The light beams of the high-density VCSEL array may have manufacturing errors, microlens assembly errors, and focus drift caused by thermal expansion, resulting in uneven braille dot matrices.

[0059] To address the above difficulties, a laser quality control link is innovatively introduced. By setting standards for real-time feedback and adjustment of the pulse width and power in the laser dot matrix according to the height of the raised dots, paper thickness and humidity, focus position, etc., the height of the braille raised dots is made moderate and compliant with the standards, and the focus is always in the correct position, ensuring printing accuracy, printing speed, and printing efficiency, achieving high-speed printing, and meeting the needs of braille printing of larger volumes such as textbooks and books.

[0060] (3) Working principle and process Working principle: The system uses a miniaturized laser array to irradiate a thermosensitive material with a pre-coated thermal expansion layer with short-time, low-energy infrared laser, causing the microcapsules in the coating to locally heat up and expand, thus forming raised dots. Each laser point works independently, and the array control system selectively activates the laser points according to the input data to form the target braille.

[0061] Working process: ① Data input. The user inputs the braille dot matrix pattern through a calculator. The control system parses the braille data into switch commands for the laser points.

[0062] ② Array driving. According to the laser dot switch command, the control system activates the corresponding laser. The laser emits short-pulse laser, and the energy is concentrated at the target position.

[0063] ③ Braille formation. The laser irradiates the thermosensitive material pre-coated with a thermal expansion layer. The microcapsules in the coating are locally heated and expanded to form raised dots. The generation of 864-square Braille dot matrix is completed at one time.

[0064] ④ System cycle: After completing the current Braille array, the system enters the next step of work to support continuous printing.

[0065] 2. Dynamic energy regulation mechanism. The software maps the Braille data into a laser dot matrix. The height of the raised dots is detected by an optical sensor, the thickness of the material is measured by a laser rangefinder, and the humidity of the material is measured by a humidity sensor. After being detected by the laser focus quality control module, the pulse width, power, and focus position of each laser dot are adjusted in real-time feedback to ensure printing accuracy.

[0066] (1) Possible mapping software implementation method: Convert Braille characters into dot matrix coordinates required for corresponding laser engraving. Then dock with the control system of the laser engraving machine and convert the dot matrix data into control instructions (such as G code).

[0067] (2) Standards for controlling the pulse width and power in the laser dot matrix ① Standard for the height of Braille raised dots: The height of Braille raised dots is generally between 0.2 - 0.5 mm.

[0068] ② Material characteristics: Papers with different thicknesses require different laser powers. Thicker papers require higher powers or longer pulse widths to achieve sufficient raised dot heights. Papers with different humidities affect the absorption of laser energy, and high humidity may reduce engraving accuracy.

[0069] ③ Laser focus quality control: The laser focus quality control system detects the focus position of each laser beam in real-time through a CMOS imaging sensor. If an offset is found, the software will automatically perform compensation adjustment. At the same time, the system uses a laser interference rangefinder to measure the paper thickness and dynamically adjusts the laser focal length to ensure that the focus is always located at the optimal focal plane of the thermosensitive material. In addition, the system is also equipped with an adaptive microlens array based on MEMS microelectromechanical technology. When a focus offset is detected, the angle of the microlens will be automatically adjusted to return the light beam to the correct position, thereby significantly improving printing accuracy.

[0070] (3) Effects of paper thickness, paper humidity, and focus position: Paper thickness affects the absorption of laser energy. Thicker papers require higher energy to form appropriate raised dots. If the thickness is not considered, it may also result in too low raised dots or burning through the paper.

[0071] The humidity of the paper affects the laser evaporation characteristics. When the humidity is high, the moisture in the material will absorb part of the laser energy, reducing the engraving efficiency and may also cause the paper to deform, thus affecting the engraving accuracy.

[0072] The position of the laser focus affects the height of the bumps and the edge clarity. If the focus deviates from the target position, it may result in irregular bump shapes or uneven heights, affecting the Braille reading experience.

[0073] Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0074] The exemplary embodiments of the present disclosure described in detail above are merely illustrative and not restrictive. Those skilled in the art should understand that various modifications and combinations can be made to these embodiments or their features without departing from the principles and spirit of the present disclosure, and such modifications should fall within the scope of the present disclosure.

Claims

1. A Braille printing device, characterized in that: The device comprises: Laser array module: composed of N*M lasers, each of which can be independently controlled to emit light beams to selectively heat heat-sensitive materials; N and M are both natural numbers greater than or equal to 1; Thermosensitive material module: located below the laser array module, used to receive the light beam and produce corresponding physical or chemical changes; Data processing module: used for receiving Braille data and converting the received Braille data into laser dot matrix instructions of Braille dot matrix; Control module: accurately controls the switching state and power output of each laser in the laser array module according to the laser dot matrix instructions; the control module also includes a convex dot quality control unit and a laser focus quality control unit; the convex dot quality control unit includes an optical sensor for detecting the height of the Braille convex dots; the laser focus quality control unit includes an imaging sensor for detecting the focal position of each laser beam.

2. The Braille printing device according to claim 1, characterized in that: The laser focus quality control unit also includes a laser distance sensor for measuring the thickness of paper and a humidity sensor for detecting the humidity of paper.

3. The Braille printing device according to claim 1, characterized in that: The number of the laser array modules is any one or more of 1-864; N is any one or more of 1-27; and M is any one or more of 1-32.

4. The Braille printing device according to claim 3, characterized in that: The single laser array module includes 6 laser points of 3 rows*2 columns; each laser point is independently controlled by a driving circuit; the arrangement of the laser points in the single laser array module includes: the point pitch is 2.2-2.8mm; when M is greater than 1, the square pitch between the left and right adjacent laser array modules is 3.5-4mm; when N is greater than 1, the row pitch between the upper and lower adjacent laser array modules is ≥5mm.

5. The Braille printing device according to claim 3, characterized in that: The laser is a laser diode or a vertical cavity surface emitting laser.

6. The Braille printing device according to claim 1, characterized in that: The device also includes a microlens corresponding to the laser one by one, and the optical axis of the microlens is precisely aligned with the light-emitting center of the laser to ensure that the light beam can be collimated through the microlens in an optimal state; the microlens adopts a silicon-based microlens to achieve light beam collimation and ensure that the focus of each laser beam falls accurately on the target position.

7. The Braille printing device according to claim 6, characterized in that: The device also includes a high thermal conductivity material substrate, and a micro heat sink or a micro thermoelectric refrigeration module is arranged on the back of the high thermal conductivity material substrate.

8. The Braille printing device according to claim 3, characterized in that: The device also includes a mechanical transmission module for moving and positioning the material to ensure that the laser beam can heat the material at the correct position.

9. The Braille printing device according to claim 1, characterized in that: The laser dot matrix instruction for converting the received Braille data into a Braille dot matrix includes: obtaining the convex point position coordinates corresponding to the Braille data according to the Braille data arrangement; generating and sending a control instruction to the control module according to the convex point position coordinates; the control module provides a conduction signal to the switch corresponding to the laser point in the laser module according to the control instruction, and controls the corresponding switch to open.

10. A Braille printing method, characterized in that: The Braille printing method is applied to the Braille printing device according to any one of claims 1 to 9, and the Braille printing method comprises: S101, obtaining Braille data; S102, converting the corresponding convex dot position coordinates in the Braille data into laser dot matrix instructions of the Braille dot matrix; S103, generating and issuing corresponding control instructions according to the laser dot matrix instruction, so that the point positions of the thermosensitive material corresponding to the laser dots are raised.

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