1330 results about "Laser engraving" patented technology

The invention relates to the technical field of machining precision control, in particular to a laser carving precision control method and system.The laser carving precision control system comprises a feature collecting unit, a model building and analyzing unit, a dynamic threshold value adjusting unit and an online incremental learning unit, and the feature collecting unit collects vibration, current and temperature data through a multi-source sensor array; the model construction analysis unit realizes dynamic prediction of processing parameters by combining a bidirectional long-short-term memory network with an attention mechanism, and the dynamic threshold adjustment unit dynamically updates parameters of a numerical control system based on a material hardness real-time detection and thermal coupling model. The online incremental learning unit automatically generates training samples through error data, continuously optimizes model parameters and constructs a'data acquisition-intelligent modeling-dynamic compensation-model evolution 'closed loop, so that accurate prediction and adaptive adjustment of machining parameters are realized, and the adaptability of the manufacturing process to multi-variety and small-batch working conditions is remarkably improved.

The invention relates to the technical field of laser engraving, and discloses a laser engraving method and system capable of automatically correcting coordinates of a galvanometer and a camera, and the method comprises the following steps: calculating a target conversion coefficient based on a calibration size and a pixel size of an image collected by the camera, and controlling the galvanometer to perform laser etching on a cross mark on the surface of a PCB (Printed Circuit Board), recording origin data of a galvanometer coordinate system; adjusting the position of the camera to enable the cross center of the view of the camera to coincide with the cross mark, and calculating the coordinate offset; coordinate space transformation is carried out on all the points to be machined, and galvanometer marking coordinate data are obtained; after laser engraving is carried out on the galvanometer marking coordinate data, an engraving area image is collected, the position residual error and the size proportion deviation are calculated, laser engraving is carried out again, and a laser engraving result is obtained. The technical problem that the visual positioning coordinate and the galvanometer marking coordinate in the laser engraving system are not consistent is effectively solved.

The invention relates to the technical field of the manufacturing industry, and discloses a high-integration variable-focus laser engraving control method and system, and the method comprises the steps: carrying out the high-frequency data collection of the surface of a workpiece through a sensor array, and obtaining an initial surface state data set; and analyzing surface tiny differences by using the feature extraction model, and determining a dynamic trend distribution diagram. A real-time monitoring technique is employed to track the surface change, and focus position correction is triggered when it is detected that the height fluctuation exceeds a threshold. And adjusting the focus position according to a deviation correction algorithm, and driving an execution mechanism to carry out real-time correction. And the processing effect is analyzed and evaluated through data comparison, a parameter optimization instruction is generated, and the dynamic adjustment control model is called to finely adjust operation parameters. And finally outputting a processing quality evaluation result, and generating a complete log file. Real-time precision monitoring and dynamic adjustment in the complex surface machining process are achieved, the machining precision and stability are improved, and the high-end manufacturing standard requirement is met.

A separating structure of a laser engraving machine having a base seat, a transport mechanism, and a separating mechanism. The base seat has a waiting area for the workpieces being stacked and a processing area, the transport mechanism includes a driving source and a transfer member electrically connected to the driving source, the transfer member carries the workpieces, the separating mechanism is arranged on the waiting area and has two forks that are capable of switching between a standby position and a detached position. When the forks are located at the standby position, the workpieces are stacked on the transfer member. When the forks are located at the detached position, the forks carry the other workpieces above the workpiece carried by the transfer member, the driving source drives the transfer member to move to the processing area for processing the workpiece.

The utility model provides a line repairing type high-definition laser plate roller engraving device which comprises a machine frame, a supporting frame is fixedly installed on the top of the machine frame, an X-axis driving mechanism is arranged on the supporting frame, a Y-axis driving mechanism is installed at the moving end of the X-axis driving mechanism, an installation base is installed at the moving end of the Y-axis driving mechanism, and a line repairing type high-definition laser plate roller engraving device is installed on the installation base. A laser engraving head is fixedly mounted on the mounting seat, a rotary clamping mechanism used for concentrically positioning and clamping a plate roller and driving the plate roller to rotate is mounted on the rack through a distance adjusting mechanism, and a lifting mechanism capable of lifting the plate roller is arranged on the rack. The distance adjusting mechanism is matched with the rotary clamping mechanism to clamp the printing rollers with different lengths, and during clamping, the axis line of the printing roller can be quickly positioned, so that the axis line of the printing roller and the axis line of the rotary shaft rod are positioned on the same straight line, and the engraving precision is further ensured.

The utility model discloses a circuit board bearing jig and processing equipment, and belongs to the technical field of laser engraving, in the circuit board bearing jig, a driving assembly drives a negative pressure adsorption platform to be lifted, so that the negative pressure adsorption platform jacks up a circuit board to be separated from a conveying mechanism, the circuit board is supported on the negative pressure adsorption platform, and the circuit board is clamped on the negative pressure adsorption platform; the adsorption force generated by the negative pressure adsorption platform enables the circuit board to be flatly laid on the negative pressure adsorption platform and to be fixed, thereby preventing the circuit board from warping, and improving the position precision and the yield of two-dimensional code engraving. In addition, the circuit board is fixed through pressure difference generated by adsorption, and compared with a mechanical clamping and fixing mode, the surface quality of the circuit board is protected.

The invention relates to the technical field of electronic recording carriers, in particular to an RFID electronic tag and a manufacturing method thereof. The method comprises the following steps that a small antenna packaged with a chip is attached to the attaching surface of bearing base cloth and fixed through dispensing, wherein non-imitation cloth of the bearing base cloth is composed of fabric; pressing the pressing cloth strip and the bearing base cloth through a roll-to-roll pressing process, so that the pressing cloth strip covers the electronic tag body and forms a clamping and fixing structure; arranging a plurality of electronic tag bodies on a base band in an array form, and conveying the electronic tag bodies to a roll-to-roll detection device to carry out functionality and consistency testing; after the test is completed, carrying out surface printing, laser code engraving and UV code printing on the electronic tag body; and obtaining target product information and writing the target product information into the RFID chip. According to the invention, efficient production of the RFID electronic tag is realized through a roll-to-roll pressing and fixing technology, so that the production efficiency is improved, and the tag identification performance and traceability are improved.

The automatic laser engraving equipment comprises a tire conveying mechanism, L-shaped fixed supporting plates are arranged on the two longitudinal sides of the tire conveying mechanism, a fixed mounting frame is arranged between the tops of the L-shaped fixed supporting plates, and a laser engraving assembly is slidably connected between the two transverse ends of the top of the fixed supporting frame in the longitudinal direction; an overturning assembly is arranged on one longitudinal side of the laser engraving assembly and is in sliding connection with the top of the fixed mounting frame in the longitudinal direction. The device has the beneficial effects that the device is reasonable in design, stable and firm in overall structure and high in practicability; the rubber tire laser engraving device is simple in structure, convenient to use, capable of achieving double-face laser engraving of the rubber tire and improving the rubber tire production and machining efficiency, capable of positioning and clamping the rubber tire so as to guarantee the position stability of the rubber tire in the laser engraving machining process and improve the effect and precision of laser engraving machining of the rubber tire, and suitable for application and popularization.

The invention discloses a preparation process of a sintering kiln silicon carbide guide roller with thermal shock resistance and high-temperature corrosion resistance. The process comprises the following steps: sequentially carrying out surface pretreatment such as reticulate pattern laser engraving, sand blasting and cleaning and drying on a silicon carbide guide roller substrate; performing plasma spraying on a pure aluminum oxide coating after preheating; carrying out segmented laser remelting on the coating to improve the compactness; and finally, coating the nano silicon carbide slurry, calcining and curing. The thermal shock resistance and the high-temperature corrosion resistance of the guide roller are remarkably improved by enhancing the binding force of the coating through laser engraving, optimizing the density of the coating through laser remelting and combining post-treatment of nano silicon carbide slurry, and the service life of the guide roller in a lithium battery positive electrode material sintering kiln is prolonged.

The invention discloses a focusing method of a laser, a focusing control device and laser etching equipment, and the focusing method of the laser comprises the steps: taking a current reference height as a starting point, and determining a plurality of different laser heights of the laser according to a current height adjustment step pitch; at each laser height, a laser device is controlled to form a plurality of light spots through laser etching, and the average diameter of the light spots corresponding to each laser height is determined; determining whether the laser height corresponding to the minimum light spot average diameter meets a preset focusing qualification condition or not; if not, the next reference height and the next height adjustment step pitch are determined according to the size relation of the light spot average diameters corresponding to the multiple different laser heights, and the steps are repeated till the laser height corresponding to the minimum light spot average diameter meets the preset focusing qualification condition. According to the technical scheme provided by the invention, laser focusing is accurately and efficiently completed, and the stability and improvement of the laser etching process quality are ensured.

The invention relates to the technical field of PCB inspection, and discloses a laser engraving device of a PCB appearance detection system, the laser engraving device comprises a fixing frame, the upper surface of the fixing frame is fixedly connected with a first motor, the output end of the first motor is fixedly provided with a rotating rod, the outer wall of the rotating rod is fixedly connected with a rotating plate, and the rotating plate is fixedly connected with a rotating shaft. A first rotating shaft is fixedly connected to the interior of the rotating plate, a rotating block is rotatably connected to the outer wall of the first rotating shaft, a second rotating shaft is fixedly connected to the interior of the rotating block, a sliding plate is rotatably connected to the outer wall of the second rotating shaft, a limiting block is fixedly connected to the upper surface of the sliding plate, and a limiting strip is slidably connected to the interior of the limiting block. The first motor is started to drive the rotating rod to rotate, through cooperation of the rotating plate, the first rotating shaft, the rotating block, the second rotating shaft, the sliding plate, the limiting block, the connecting plate, the spring and the clamping plates, the distance between the clamping plates is adjusted, the effect of being suitable for PCBs of different sizes and fixing the PCBs is achieved, and the stability in the transferring process is guaranteed.

The present invention relates to the technical field of laser processing, and particularly to a dual-source laser engraving machine. It includes a frame, on which there are two laser emitters, a front mirror assembly, a laser engraving head, and an intermediate mirror unit; the two laser emitters respectively emit a first laser and a second laser; the front mirror assembly includes a first front mirror and a second front mirror, and a displacement mechanism for changing the position of the first front mirror or / and the second front mirror; the intermediate mirror unit includes a first intermediate mirror and a second intermediate mirror, and further includes a switching mechanism for switching the positions of the first intermediate mirror and the second intermediate mirror; the displacement mechanism is connected to the switching mechanism through a transmission unit and acts synchronously. The intermediate mirror unit of the present invention can effectively reduce the loss of the laser and improve the utilization rate by setting the ability to switch the first front mirror and the second front mirror.

The invention discloses a wheel hub supporting device for wheel hub laser engraving, and relates to the technical field of laser engraving cutting machines, a wheel hub is clamped through an electric telescopic rod, a fixing plate, a sliding rod and a clamping plate, when the clamping force is too large, the clamping plate is stressed to move inwards to be matched with the sliding rod, a limiting rod and a clamping groove plate, so that the fixing plate cannot continue to move forwards; when one side of the hub is engraved, the clamping plate stops moving, in this way, the clamping plate conducts anti-clamping measures on the hub during clamping, improper clamping possibly enables the hub to locally bear overlarge stress, and hidden damage such as microscopic cracks is generated on the surface or the internal structure of the hub. The whole fixing device is turned over through the driving frame and the electric telescopic rod, namely, a hub is turned over, the whole production process can be smoother through turning-over operation, the equipment downtime caused by hub assembling and disassembling is shortened, and the equipment utilization rate and the production efficiency are improved.

The invention discloses a multi-mark automatic laser carving method and system combined with industrial vision and a medium, and relates to the related technical field of laser carving, and the method comprises the steps that a product to be subjected to laser carving of an automatic laser carving machine is obtained; generating laser etching content and performing control mining on the laser etching module in combination with the product feature data; performing multi-dimensional risk prediction on the laser etching analysis scheme according to a laser etching risk predictor; if the laser etching risk prediction result does not meet the laser etching risk constraint, variation adjustment is carried out, and a candidate laser etching group is established; a laser etching global optimization mechanism is introduced for optimization analysis, and a laser etching optimization strategy is determined; and the product to be subjected to laser etching is conveyed to a preset position, and the laser etching module is synchronously started to execute the laser etching optimization strategy. The technical problems that in the prior art, the multi-mark product laser etching efficiency is low, the laser etching scheme lacks risk assessment optimization, and the laser etching product quality consistency is poor are solved, and the technical effects that the multi-mark product laser etching automation and production efficiency are improved, and the product laser etching quality consistency and stability are improved are achieved.

The invention discloses a machining control method and system for a laser engraving machine, and belongs to the technical field of laser engraving machines. The machining control method comprises the steps that a closed contour, a gradually-changed filling area and a high-precision edge in a pattern are automatically recognized; a cutting path is optimized in combination with an improved ant colony algorithm and a hierarchical genetic algorithm, and meanwhile, a real-time obstacle avoidance subsystem is included to avoid collision; an S-shaped acceleration and deceleration curve planner and a laser power dynamic compensation model are used for optimizing the motion process and laser output. According to the machining control method for the laser engraving machine, automatic and intelligent control over the whole process from design file import to machining completion is achieved, the machining efficiency and accuracy are improved, and the machining cost and risk are remarkably reduced.

The invention relates to a large-breadth flexible damage sensing material and a preparation method thereof, belongs to the field of intelligent material preparation, and solves the problem that large-scale preparation of the large-breadth flexible damage sensing material is difficult in the prior art. The invention discloses a large-breadth flexible damage sensing material and a preparation method thereof. The large-breadth flexible damage sensing material comprises a flexible substrate layer, a conductive layer and a packaging layer, wherein the conductive layer is superposed on the flexible substrate layer; the packaging layer covers the conductive layer; the conductive layer is made of a laser-engraved polyimide film, a functional laser-induced graphene structure and an auxiliary separation structure which are etched by a laser engraving machine are arranged on the conductive layer, and the auxiliary separation structure comprises a film through hole and an edge cutting line; the large-breadth flexible damage sensing material provided by the invention is high in fineness, stable in performance and capable of meeting large-breadth sensing application, the preparation method of the large-breadth flexible damage sensing material is simple in step and high in preparation efficiency, and the large-breadth flexible damage sensing material which is stable in performance and high in fineness can be prepared in batches.

The utility model discloses a laser lettering automatic feeding mechanism which comprises a bearing plate, and a conveying belt is installed on the inner side of the bearing plate. According to the laser engraving machine, an object to be subjected to laser engraving can be placed in a groove reserved in the bearing frame, then the bearing frame is placed on the conveying belt, the conveying belt can drive the bearing frame to move to the position under the laser engraving machine, and in the moving process, the bearing frame can be clamped into the inner side of the calipers; the air cylinder can drive the first motor and the bearing frame to move upwards, the first motor can drive the movable frame to rotate reversely, so that an object on the bottom face is exposed under the laser carving machine, the second motor can remove the movable frame from the position below the laser carving machine after two-face carving is completed, and the number of single-time laser carving is increased; and moreover, the time of single-time laser etching can be prolonged, the overall speed of an assembly line can be increased, the carved objects and the bearing frame can have enough cooling time, and the problem that hands are scalded when follow-up packaging operators take the objects is solved.

1. Name of the Design Product: Laser Engraver (Miniature). 2. Use of the Design Product: For laser engravers. 3. Design Key Points of the Design Product: Lies in the shape. 4. Picture or Photograph that Best Illustrates the Design Key Points: Perspective View 1.

The invention discloses a large-ink-load ceramic anilox roller laser engraving system and an engraving method thereof, relates to the field of ceramic roller laser engraving, and aims to solve the problems of limited ink load increase, low production efficiency and the like in the prior art. The system comprises a laser head, a ceramic roller and an ink cell observer, and further comprises an ink cell image acquisition module, a test point positioning module, an engraving control module, an analysis module and an auxiliary scanning planning module. The laser head comprises a laser, a high-frequency torque motor and the like, the high-frequency torque motor can drive a reflecting mirror to move so as to adjust a laser beam track, and the method comprises the steps of generating net-shaped data, positioning an ink cell and a test point, matching laser power to engrave the test point, comparing a data output strategy, dynamically adjusting an auxiliary scanning track and then engraving; double scanning tracks are adopted, the laser power and tracks are adaptively controlled in combination with real-time visual feedback, fine engraving of ink cells is achieved, the ink loading amount, the ink transfer uniformity and the production efficiency are improved, and ceramic damage is avoided.

The technical scheme of the utility model discloses a laser engraving machine. The laser engraving machine comprises a plurality of laser light sources and a focusing lens, the number of the reflecting pieces is the same as that of the laser light sources, and the reflecting pieces are arranged in laser paths of the multiple laser light sources in a one-to-one correspondence mode; the reflecting piece is used for changing the propagation direction of the laser, so that the reflected laser is emitted into the focusing lens in the same direction; the focusing lens is used for converging the laser reflected by the reflecting piece to form a light spot; an imaging lens; and the imaging lens is used for imaging the light spots to a carving surface. According to the laser engraving machine, laser of the multiple laser light sources is combined in a wedge light combination mode, the utilization rate of the lens is improved, more laser light sources can be arranged in the direction with the small laser light expansion amount, and the energy density of light spots and the power of the laser engraving machine are improved.

The invention provides a notebook keyboard composite skin-touch paint film and a preparation process thereof. The notebook keyboard composite skin-touch paint film comprises a primer layer, a middle paint layer and a UV skin-touch finish paint layer which are sequentially arranged on the surface of a notebook keyboard base material, the primer layer is prepared from the following components in percentage by weight: 20 to 30 percent of hydroxy acrylic resin, 15 to 25 percent of modified epoxy acrylate, 5 to 10 percent of vinyl modified fumed silica, 5 to 10 percent of fluorosilicone resin, 5 to 10 percent of epoxy phosphate, 5 to 10 percent of filler, 15 to 25 percent of solvent A, 2 to 4 percent of curing agent, 0.1 to 0.3 percent of flatting agent and 0.1 to 0.3 percent of defoaming agent; the middle paint layer is prepared from the following components: 40 to 50 percent of acrylic polyurethane resin, 12 to 16 percent of filler, 1 to 3 percent of cerium oxide, 7 to 12 percent of laser carving toner, 1 to 3 percent of dispersing agent, 20 to 30 percent of solvent B, 0.1 to 0.3 percent of plasticizer, 0.1 to 0.3 percent of flatting agent and 0.1 to 0.3 percent of defoaming agent; the UV skin-touch finish paint layer is prepared from the following components: 52 to 55 percent of polyurethane acrylate resin, 15 to 25 percent of reactive diluent, 2 to 4 percent of photoinitiator, 10 to 15 percent of skin-touch additive, 5 to 10 percent of filler, 0.1 to 0.3 percent of flatting agent and 0.1 to 0.3 percent of antioxidant. The paint film provided by the invention has the advantages of favorable wear resistance, favorable adhesive force and favorable hand feeling.

The invention discloses a processing method of a polybutylene terephthalate bar with laser etching performance, and relates to the technical field of high polymer material processing and surface modification.The processing method comprises the following steps that in the material melting stage, a synchronous observation system of a melt rheological behavior and a temperature field is established, micro-amplitude sine torque disturbance is introduced, and the temperature field is measured; obtaining dynamic response of viscosity and shear rate, and generating a flowing fingerprint baseline; and performing spectrum decomposition on the flow fingerprint baseline, extracting signal components causing pressure pulsation, determining a critical shear rate threshold and time delay thereof, and forming a discrimination condition of an unstable region. According to the method, shear characteristics are extracted through rheological disturbance and thermal field synchronous observation, space mask driving process simulation is constructed, a feedforward adjusting curve is output, density online estimation and phase recognition are introduced, micro-pulse disturbance and temperature fine adjustment are combined, closed-loop control is formed, melt flow is dynamically stabilized, and laser engraving consistency and the product yield are improved.

According to the special-shaped curved surface laser etching data self-adaptive blocking and track path optimization method, the size of a laser etching block is automatically adjusted according to the curvature radius change of a laser etching pattern, and it is guaranteed that the size of the laser etching data block is smaller than the maximum scanning range of a scanning galvanometer and smaller than the maximum scanning range of the scanning galvanometer; it is guaranteed that the arch height in the blocks is smaller than the focal depth of the etching laser beam, the maximization of the sizes of the blocks is achieved on the premise that the laser etching precision is guaranteed, and the laser efficiency is improved; for a certain laser etching data block, a laser etching track is optimized, so that the idle time of a scanning galvanometer is shortened, and the laser scanning etching efficiency is improved; different laser etching data are partitioned, the moving path of the five-axis moving mechanism is optimized, the idle time of the five-axis moving mechanism is shortened, and the overall efficiency of laser etching is improved.

The utility model discloses an automatic laser carving machine which has an automatic feeding, discharging and stacking function, can carry out feeding, discharging and laser carving operation at the same time, and improves production efficiency. The tray stacking device comprises a tray feeding mechanism and a tray discharging mechanism, a tray conveying device is arranged between the tray feeding mechanism and the tray discharging mechanism, the tray feeding mechanism and the tray discharging mechanism are used for stacking trays, and a plurality of products are placed in the trays. A tray positioning and clamping device is arranged in the middle of the tray conveying device, a rotating mechanism is arranged at the front end of the tray positioning and clamping device, a carrier assembly matched with a product is arranged on the rotating mechanism, and a feeding and discharging robot is arranged on one side between the rotating mechanism and the tray positioning and clamping device. And a laser etching device is arranged above the rear end of the rotating mechanism. The laser engraving machine is applied to the technical field of laser engraving equipment.

The invention relates to the technical field of laser engraving machine positioning, and discloses a laser engraving machine positioning method integrated with visual positioning in order to solve the problem that in the prior art, distortion correction of a camera calibration image is simple, and large mapping deviation of the image is easily caused. By means of a series of accurate algorithms and steps such as camera calibration, distortion correction and coordinate alignment, the positioning error is controlled within + / -0.1 mm, the high-precision machining requirement is met, the automatic visual positioning process greatly reduces the manual intervention cost, the positioning time is effectively shortened, and due to the fact that a follow-up laser emission path is automatically generated, the precision is high. According to the laser engraving machine, the control requirement for operators is further reduced, the use convenience of the device is improved, complex contour positioning of workpieces of various shapes and structures is further improved by means of distortion correction and the like, and the application range of the laser engraving machine is widened.

The invention discloses an alloy product surface laser engraving device, and relates to the field of laser engraving, the alloy product surface laser engraving device comprises a fixed shell, a mounting frame is fixedly mounted in the fixed shell, a laser engraving head is slidably mounted on the mounting frame, and a driving pipe is fixedly connected to the laser engraving head; and the cleaning structure comprises a first cleaning plate and a second cleaning plate, an auxiliary structure is installed between the first cleaning plate and the second cleaning plate, the side wall of the mounting frame is rotationally connected with a reciprocating lead screw and a fixing rod, and the reciprocating lead screw and the fixing rod are in transmission connection through a belt transmission assembly. According to the laser engraving head cleaning device, a lens and an alloy plate of a laser engraving head can be cleaned, residual cooled metal steam and oil stains on the lens and dust on the alloy plate are cleaned up, the influence on engraving is avoided, meanwhile, the second cleaning plate can swing back and forth, the cleaning effect is further improved, and the problem of engraving precision and efficiency is avoided.

The invention provides a laser engraving path planning method, system and device and a medium, and relates to the technical field of laser engraving, the method comprises the steps that a preset format file is obtained, and the preset format file comprises a three-dimensional model of a to-be-machined part; performing cross cutting on the three-dimensional model to obtain a plurality of intersection points and a plurality of intersection lines; performing contour reconstruction on the three-dimensional model based on each intersection point and each intersection line to obtain at least one closed region segmentation curve; based on each region segmentation curve, determining an inclusion relation among the region segmentation curves by adopting a Vatti polygon cutting algorithm; establishing a topological relation tree based on inclusion relations among the region segmentation curves; performing region division based on the topological relation tree to obtain a plurality of different processing regions; and for each machining area, a preset filling method is adopted to generate a corresponding carving tool path. According to the method, the machining precision is guaranteed through local intersection point and intersection line processing while the machining area is accurately and rapidly divided to generate the carving tool path.

The invention relates to the technical field of myopia prevention and control, and discloses a correction and training integrated lens and glasses based on retina signal gradient remodeling. The lens substrate is divided into a vision correction area located in the center and a multi-dimensional three-dimensional asymmetric optical signal field extending outwards in a gradient mode around the vision correction area. The multi-dimensional stereoscopic asymmetric optical signal field comprises 10000-26000 asymmetric signal field independent units and 400-1500 stereoscopic structure protrusions, wherein the asymmetric signal field independent units are formed on the concave surface of the lens substrate through laser engraving, the diameter range of the asymmetric signal field independent units is 100-300 microns, and the stereoscopic structure protrusions are formed in a protruding mode, and the diameter range of the stereoscopic structure protrusions is 0.5-2 mm. And 4-12 asymmetric signal field independent units are distributed on each three-dimensional structure bulge. The lens does not induce or increase astigmatism due to the structure of the lens, and can relieve the over-stimulation of long-time close-range eye use and abnormal environment illumination signals on the retina, so as to slow down the over-growth of the ocular axis.

The invention relates to the technical field of display screen engraving, in particular to display screen machining and engraving equipment which comprises a machining box body and a laser engraving machine, a transverse displacement mechanism for moving a display screen is arranged at the top of the machining box body, and a base block is arranged at the top of the transverse displacement mechanism; a base block is arranged on the moving frame, a fixing frame for carving and positioning a display screen is movably arranged on the top of the base block, an inclined material overturning assembly for overturning and cleaning the fixing frame is arranged on the base block, and a blast discharging assembly for cleaning the top of the fixing frame is arranged on the moving frame. Machining scraps originally attached to or accumulated on the top and the peripheral edge of the display screen are effectively stripped under the action of gravity, a cleaning spray head in the air blowing discharging assembly is used for stripping, guiding airflow pointing to a containing hole is formed, and the stripped scraps and dust are separated from the display screen under the combined action of airflow coercing and gravity. And the air is efficiently and directionally purged and guided into the accommodating hole.