A printing device and printing method of light field microlens array

Abstract

The present invention discloses a printing device and a printing method of a light field microlens array. It relates to the technical field of optical device manufacturing. The present application specifically includes a motion platform, a Y-axis moving module arranged on the motion platform, a gantry arranged on the motion platform, an X-axis moving module arranged on the gantry, a Z-axis moving module arranged on the X-axis moving module, and a print head arranged on the Z-axis moving module. The substrate is arranged on the Y-axis moving module, and the print head includes a plurality of light field microlens printing needles distributed in an array. The present invention drives the substrate to move along the Y-axis direction through the Y-axis moving module, drives the Z-axis moving module and the print head to move along the X-axis direction through the X-axis moving module, and drives the print head to move along the Z-axis direction through the Z-axis moving module, and adjusts the relative position of the substrate and the print head in the X, Y, and Z axis directions, thereby improving the printing accuracy of the light field microlens array on the substrate and ensuring product quality.

Description

Technical Field

[0001] The present invention relates to the technical field of optical device manufacturing, and in particular to a printing device and a printing method for a light field microlens array. Background Art

[0002] Light field microlens array is a widely used micro-optical element, also known as the core component of the next generation optical imaging system. It is an array composed of a series of micro-lenses with apertures ranging from a few microns to hundreds of microns arranged in a certain manner. It has the advantages of good optical performance, large field of view, small aberration distortion, etc., and is widely used in beam shaping, three-dimensional imaging, bionic compound eyes, LED and OLED light extraction and other fields.

[0003] At present, the main methods for manufacturing and processing light field microlens arrays are thermal reflow method, laser direct writing method and microjet printing method. Among them, the microjet printing method is to use a precise nozzle and a precise position control platform to extrude the glue through the nozzle, and then print droplets with microlens morphology on the surface of the substrate. This method is highly efficient and simple to operate, and has the advantages of low cost, high speed and high efficiency. Therefore, at this stage, the microjet printing method is the main research direction for the production of light field microlens arrays. For printing equipment that uses microjet printing to produce light field microlens arrays, how to improve the printing accuracy of the light field microlens array on the substrate and ensure product quality is the main problem that needs to be solved urgently. Summary of the invention

[0004] The purpose of the present invention is to provide a printing device and a printing method for a light field microlens array to improve the printing accuracy of the light field microlens array on a substrate and ensure product quality, in view of the above-mentioned deficiencies in the prior art.

[0005] The present invention provides a printing device for a light field microlens array, comprising a motion platform, a Y-axis moving module arranged on the motion platform, a gantry arranged on the motion platform, an X-axis moving module arranged on the gantry, a Z-axis moving module arranged on the X-axis moving module, and a print head arranged on the Z-axis moving module, wherein a substrate is arranged on the Y-axis moving module; the print head comprises a plurality of light field microlens printing needles distributed in an array on the Z-axis moving module, wherein the plurality of light field microlens printing needles are used to print on the substrate to form a light field microlens array, the Y-axis moving module moves back and forth along the Y-axis direction on the motion platform, the gantry extends along the X-axis direction on the motion platform, the X-axis moving module moves back and forth along the axial direction on the gantry, and the Z-axis moving module moves back and forth along the Z-axis direction on the X-axis moving module.

[0006] Furthermore, a first guide rail is arranged on the motion platform along the Y-axis direction, and the Y-axis moving module includes a first sliding seat slidably connected to the first guide rail, and a horizontal suction cup arranged on the first sliding seat, and the first sliding seat can move back and forth along the Y-axis direction on the first guide rail, and the substrate is arranged on the horizontal suction cup, and the horizontal suction cup is used to adsorb or release the substrate.

[0007] Furthermore, an edge adsorption area and a center adsorption area are distributed on the upper surface of the horizontal suction cup, the edge adsorption area is used to adsorb the periphery of the substrate, and the center adsorption area is used to adsorb the middle of the substrate.

[0008] Furthermore, the horizontal suction cup is provided with a plurality of through holes, and the printing device further comprises a plurality of telescopic ejector rods arranged in the motion platform, and the plurality of telescopic ejector rods can extend from the plurality of through holes respectively to lift the substrate away from the horizontal suction cup.

[0009] Furthermore, the Y-axis moving module also includes an auxiliary alignment component disposed on the first sliding seat, and the auxiliary alignment component is used to calibrate the position of the light field microlens printing needle in the Z-axis direction.

[0010] Furthermore, the auxiliary alignment assembly includes a mounting seat fixedly connected to the first sliding seat, and a calibration column arranged on the mounting seat, wherein the mounting seat is used to fix the calibration column on the first sliding seat, and the calibration column is used to calibrate the position of the light field microlens printing needle in the Z-axis direction.

[0011] Furthermore, the printing device also includes a visual alignment component arranged on the X-axis moving module, and the visual alignment component is used to calibrate the position of the light field microlens printing needle in the X-axis direction and the Y-axis direction.

[0012] Furthermore, a second guide rail is provided on the gantry along the X-axis direction, the X-axis moving module includes a second sliding seat slidably connected to the second guide rail, the second sliding seat can move back and forth along the X-axis direction on the second guide rail, and the Z-axis moving module is arranged on the second sliding seat.

[0013] Furthermore, a third guide rail is arranged on the second sliding seat along the Z-axis direction, the Z-axis moving module includes a sliding beam slidably connected to the third guide rail, and a connecting frame arranged on the sliding beam, the sliding beam can move back and forth along the Z-axis direction on the third guide rail, and the print head is arranged on the connecting frame.

[0014] Furthermore, the print head also includes a plurality of fluid valves arranged on the top of the connecting frame, the plurality of light field microlens printing needles are distributed in an array at the bottom of the connecting frame, and the plurality of fluid valves are distributed in an array at the top of the connecting frame, so as to supply the plurality of light field microlens printing needles respectively.

[0015] Furthermore, the print head also includes a visual observation component arranged on the front side of the connecting frame, and the visual observation component is used to observe the printing status of the plurality of light field microlens printing needles.

[0016] Furthermore, a fourth guide rail is provided on the front side of the connecting frame along the X-axis direction, and the visual observation component includes a third sliding seat slidably matched with the fourth guide rail, a ball screw arranged on the front side of the connecting frame, a mounting frame arranged on the third sliding seat, and a visual observation camera arranged on the mounting frame, the ball screw is used to drive the third sliding seat to move back and forth on the fourth guide rail along the X-axis direction, the mounting frame is used to set up the visual observation camera on the front side of the plurality of light field microlens printing needles, and the visual observation camera is used to observe the printing status of the plurality of light field microlens printing needles.

[0017] Furthermore, the vision alignment assembly includes a fourth sliding seat slidably connected to the second guide rail, a servo rail arranged on the fourth sliding seat along the Z-axis direction, a fifth sliding seat arranged on the servo rail, and a vision alignment camera arranged on the fifth sliding seat.

[0018] Furthermore, the printing device also includes a correction platform arranged on one side of the moving platform, a correction component arranged on the correction platform, and a visual positioning component arranged on the correction platform, the visual positioning component is used to locate and identify the substrate on the correction component, the correction component is used to correct the substrate, and the substrate is transferred from the correction platform to the moving platform.

[0019] Furthermore, the visual positioning component includes a support frame arranged on the correction platform, a connecting beam arranged on the support frame, and a visual positioning module arranged on the connecting beam, the support frame extends along the X-axis direction on the correction platform, the connecting beam extends along the Y-axis direction on the support frame, and can move back and forth axially on the support frame, and the visual positioning module can move back and forth along the Y-axis direction on the connecting beam, so as to position and identify the substrate on the correction component.

[0020] Furthermore, the support frame is axially provided with a fifth guide rail, the connecting beam is slidably connected to the fifth guide rail, a sixth guide rail is axially provided on the connecting beam, and the visual positioning module includes a sixth sliding seat slidably connected to the sixth guide rail, and a visual recognition camera arranged on the sixth sliding seat.

[0021] Furthermore, the deviation correction component includes a rotating seat arranged on the deviation correction platform, and a material receiving platform arranged on the rotating seat, the material receiving platform is used to receive the substrate, and the rotating seat is used to drive the material receiving platform to rotate.

[0022] The present invention also provides a method for printing a light field microlens array, comprising the following steps:

[0023] Acquire position information of the substrate, and adjust the angle of the substrate according to the position information;

[0024] Calibrate the printing height of the substrate, and adjust the position of the print head in the Z-axis direction according to the calibrated printing height;

[0025] The printing position of the substrate is calibrated, and the relative positions of the print head and the substrate in the X-axis direction and the Y-axis direction are adjusted according to the calibrated printing position, so that the print head prints on the substrate to form a light field microlens array.

[0026] Further, calibrating the printing height of the substrate, and adjusting the position of the print head in the Z-axis direction according to the calibrated printing height, comprises the following steps:

[0027] The print head is driven to move by the X-axis moving module, the Y-axis moving module and the Z-axis moving module so that the print head contacts the calibration column;

[0028] The relative height distance between the calibration column and the substrate is measured by a height sensor to obtain the relative height distance between the current print head and the substrate;

[0029] According to the current relative height distance between the print head and the substrate, and the target height distance between the print head and the substrate, the distance data that the Z-axis moving module needs to drive the print head to move is obtained;

[0030] According to the acquired data, the Z-axis moving module is controlled to drive the print head to move a corresponding distance.

[0031] The printing device and printing method of a light field microlens array proposed by the present invention have the following beneficial effects:

[0032] (1) This printing device drives the substrate to move back and forth along the Y-axis direction through the Y-axis moving module to adjust the relative position of the substrate and the print head in the Y-axis direction, drives the Z-axis moving module and the print head to move back and forth along the X-axis direction through the X-axis moving module to adjust the relative position of the substrate and the print head in the X-axis direction, and drives the print head to move back and forth along the Z-axis direction through the Z-axis moving module to adjust the relative position of the substrate and the print head in the Z-axis direction, thereby improving the printing accuracy of the light field microlens array on the substrate and ensuring product quality;

[0033] (2) The upper surface of the horizontal suction cup of the printing device is distributed with an edge suction area and a center suction area. When the substrate is placed on the horizontal suction cup by the robot, the edge suction area suctions the surrounding of the substrate, and the center suction area suctions the middle of the substrate, so that the substrate is fixed more stably on the horizontal suction cup, further ensuring the position accuracy of the substrate during the printing process;

[0034] (3) The motion platform of the printing device is provided with a plurality of telescopic push rods, and the horizontal suction cup is provided with a plurality of through holes. The plurality of telescopic push rods extend out, penetrate through the plurality of through holes respectively, and extend above the horizontal suction cup to push the substrate off the upper surface of the horizontal suction cup and support the substrate, thereby lifting the substrate off the horizontal suction cup, making it easier for the robot to remove the substrate from the horizontal suction cup, thereby making the use of the printing device simpler, more convenient, and more practical;

[0035] (4) The auxiliary alignment component of the printing device includes a mounting seat and a calibration column. The mounting seat fixes the calibration column on the first sliding seat. The calibration column extends along the Z-axis direction on the mounting seat. The height of the multiple light field microlens printing needles is calibrated by the calibration column, so that the height adjustment of the multiple light field microlens printing needles in the Z-axis direction is more accurate, thereby improving the printing accuracy of the light field microlens array on the substrate;

[0036] (5) The printing device also includes a visual alignment component disposed on the X-axis moving module, through which the position of the substrate on the Y-axis moving module in the X-axis direction and the Y-axis direction is calibrated, thereby ensuring the position accuracy of the substrate and the print head in the X-axis direction and the Y-axis direction and improving the printing efficiency of the printing device.

[0037] (6) The print head of the printing device also includes a visual observation component, which is arranged on the front side of the connecting frame. The visual observation component is used to observe the printing status of the multiple light field microlens printing needles, so as to monitor in real time the positions of the multiple light field microlens printing needles printing the light field microlens array on the substrate and whether the multiple light field microlens printing needles are discharging smoothly, so as to facilitate timely adjustment of the positions of the multiple light field microlens printing needles and clearing of blocked light field microlens printing needles, thereby ensuring the printing quality of the light field microlens array;

[0038] (7) The printing device also includes a correction platform disposed on one side of the motion platform, a correction component disposed on the correction platform, and a visual positioning component disposed on the correction platform, wherein the visual positioning component is used to locate and identify the substrate on the correction component, and the correction component is used to correct the substrate, thereby adjusting the angular deviation of the substrate, further improving the printing accuracy of the light field microlens array on the substrate, and ensuring product quality;

[0039] (8) This printing method adjusts the angle of the substrate by obtaining the position information of the substrate, and controls the accuracy of the relative position between the print head and the substrate in the X-axis direction, the Y-axis direction, and the Z-axis direction by calibrating the printing height and the printing position of the substrate, thereby improving the printing accuracy of the light field microlens array on the substrate and ensuring product quality;

[0040] (9) In this printing method, the print head is calibrated by setting a calibration column on the Y-axis moving module, so that the distance measuring sensor can obtain the relative distance between the current print head and the substrate by measuring the relative distance between the distance measuring sensor and the substrate and the relative distance between the distance measuring sensor and the calibration column. Therefore, when multiple sets of X-axis moving modules are set on the gantry, only one distance measuring sensor is needed to realize the measurement of the relative distance between the current print head and the substrate on multiple sets of X-axis moving modules, thereby greatly reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In the accompanying drawings, like reference numerals are used to represent like elements.

[0042] Figure 1 A schematic diagram of the structure of a motion platform of a light field microlens array printing device according to an embodiment of the present invention;

[0043] Figure 2 A plan view of the interior of a box of a printing device of a light field microlens array according to an embodiment of the present invention;

[0044] Figure 3 This is a schematic structural diagram of a Y-axis moving module of a light field microlens array printing device on a moving platform according to an embodiment of the present invention;

[0045] Figure 4 A schematic diagram of the structure of a horizontal suction cup of a printing device for a light field microlens array according to an embodiment of the present invention;

[0046] Figure 5 This is a schematic structural diagram of an X-axis moving module, a Z-axis moving module and a print head on a gantry of a light field microlens array printing device according to an embodiment of the present invention;

[0047] Figure 6 This is a schematic structural diagram of a Z-axis moving module and a print head on an X-axis moving module of a printing device of a light field microlens array according to an embodiment of the present invention;

[0048] Figure 7 A schematic diagram of the structure of a visual alignment component of a printing device for a light field microlens array according to an embodiment of the present invention;

[0049] Figure 8 A schematic structural diagram of a correction platform of a light field microlens array printing device according to an embodiment of the present invention;

[0050] Fig. 9 A schematic diagram of the structure of a visual positioning component of a printing device of a light field microlens array according to an embodiment of the present invention;

[0051] Fig.10 A schematic structural diagram of a deflection correction component of a light field microlens array printing device according to an embodiment of the present invention;

[0052] Fig.11 The present invention is a schematic diagram of a temperature control box for printing equipment of a light field microlens array according to an embodiment of the present invention.

[0053] In the figure: 1, motion platform; 11, Y-axis moving module; 111, first sliding seat; 112, horizontal suction cup; 1121, edge adsorption area; 1122, center adsorption area; 1123, through hole; 113, telescopic top rod; 114, auxiliary alignment component; 1141, calibration column; 1142, mounting seat; 12, gantry; 121, second guide rail; 13, X-axis moving module; 131, second sliding seat; 1311, third guide rail; 132, visual alignment component; 1321, fourth sliding seat; 1322, servo guide rail; 1323, fifth sliding seat; 1324, visual alignment camera; 14, Z-axis moving module; 141, sliding beam; 142, connecting frame; 1 421. Fourth guide rail; 15. Print head; 151. Light field microlens print needle; 152. Fluid valve; 153. Third sliding seat; 154. Ball screw; 155. Mounting frame; 156. Visual observation camera; 16. First guide rail; 2. Correction platform; 21. Correction assembly; 211. Rotating seat; 212. Material receiving platform; 22. Visual positioning assembly; 221. Support frame; 2211. Fifth guide rail; 222. Connecting beam; 2221. Sixth guide rail; 223. Sixth sliding seat; 224. Visual recognition camera; 3. Temperature control box; 31. Box; 32. Purification system; 33. Temperature control system; 34. Feeding gate valve; 4. Transfer mechanism; 5. Substrate. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0055] See also Figures 1 to 11 A printing device for a light field microlens array according to an embodiment of the present invention comprises a motion platform 1, a Y-axis moving module 11 arranged on the motion platform 1, a gantry 12 arranged on the motion platform 1, an X-axis moving module 13 arranged on the gantry 12, a Z-axis moving module 14 arranged on the X-axis moving module 13, and a print head 15 arranged on the Z-axis moving module 14, and a substrate 5 is arranged on the Y-axis moving module 11.

[0056] The print head 15 includes a plurality of light field microlens printing needles 151 distributed in an array on the Z-axis moving module 14, and the plurality of light field microlens printing needles 151 are used to print on the substrate 5 to form a light field microlens array. The Y-axis moving module 11 moves back and forth along the Y-axis direction on the moving platform 1, the gantry 12 extends along the X-axis direction on the moving platform 1, the X-axis moving module 13 moves back and forth along the axial direction on the gantry 12, and the Z-axis moving module 14 moves back and forth along the Z-axis direction on the X-axis moving module 13.

[0057] In this embodiment, the printing device includes a motion platform 1 and a Y-axis moving module 11, and the Y-axis moving module 11 is arranged on the motion platform 1. When printing the light field microlens array of the substrate 5, the substrate 5 is arranged on the Y-axis moving module 11, and the Y-axis moving module 11 moves back and forth along the Y-axis direction on the motion platform 1, driving the substrate 5 to move back and forth along the Y-axis direction on the motion platform 1 synchronously, thereby adjusting the relative position of the substrate 5 and the print head 15 in the Y-axis direction.

[0058] The printing device further includes a gantry 12, an X-axis moving module 13, a Z-axis moving module 14, and a print head 15. The gantry 12 is arranged on the motion platform 1 and extends along the X-axis on the motion platform 1. The X-axis moving module 13 is arranged on the gantry 12, the Z-axis moving module 14 is arranged on the X-axis moving module 13, and the print head 15 is arranged on the Z-axis moving module 14, so that the print head 15 is mounted above the Y-axis moving module 11 through the gantry 12.

[0059] By the X-axis moving module 13 moving back and forth along the axial direction on the gantry 12, the Z-axis moving module 14 and the print head 15 can be driven to move back and forth along the X-axis direction above the Y-axis moving module 11 synchronously, thereby adjusting the relative position of the substrate 5 and the print head 15 in the X-axis direction.

[0060] By the Z-axis moving module 14 moving back and forth along the Z-axis direction on the X-axis moving module 13, the print head 15 can be driven to move back and forth along the Z-axis direction above the Y-axis moving module 11 synchronously, thereby adjusting the relative position of the substrate 5 and the print head 15 in the Z-axis direction.

[0061] The print head 15 includes a plurality of light field microlens printing needles 151 distributed in an array on the Z-axis moving module 14. After the relative positions of the plurality of light field microlens printing needles 151 and the substrate 5 in the Y-axis direction, the X-axis direction and the Z-axis direction are adjusted, the printing material is extruded through the plurality of light field microlens printing needles 151, thereby printing on the substrate 5 to form a light field microlens array, thereby improving the printing accuracy of the light field microlens array on the substrate 5 and ensuring product quality.

[0062] In this embodiment, the light field microlens array can be a single-layer light field microlens array composed of a single layer of light field lens material, or it can be a multi-layer light field microlens array composed of multiple layers of light field lens material. Therefore, this printing device can print a single-layer light field microlens array, and can also print a multi-layer light field microlens array.

[0063] When printing a multi-layer light field microlens array, multiple groups of X-axis moving modules 13 can be set on the gantry 12, each group of X-axis moving modules 13 is provided with a Z-axis moving module 14 and a print head 15, and each group of print heads 15 can print a light field lens material.

[0064] Specifically, when printing is performed, multiple groups of X-axis moving modules 13 can respectively drive multiple groups of Z-axis moving modules 14 and print heads 15 located thereon to move along the X-axis direction, and multiple groups of Z-axis moving modules 14 can respectively drive multiple groups of print heads 15 located thereon to move along the Z-axis direction, so that multiple groups of print heads 15 successively print multiple layers of light field lens materials on the substrate 5, thereby forming a multi-layer light field microlens array on the substrate 5.

[0065] In this embodiment, a first guide rail 16 is arranged on the motion platform 1 along the Y-axis direction, and the Y-axis moving module 11 includes a first sliding seat 111 slidably connected to the first guide rail 16, and a horizontal suction cup 112 arranged on the first sliding seat 111. The first sliding seat 111 can move back and forth along the Y-axis direction on the first guide rail 16. The substrate 5 is arranged on the horizontal suction cup 112, and the horizontal suction cup 112 is used to adsorb or release the substrate 5.

[0066] In this embodiment, the Y-axis moving module 11 includes a first sliding seat 111 and a horizontal suction cup 112. When loading the substrate 5, the substrate 5 is placed on the horizontal suction cup 112, and the substrate 5 is adsorbed by the horizontal suction cup 112 to fix the substrate 5, thereby preventing the substrate 5 from shifting on the horizontal suction cup 112 during movement and printing, thereby affecting the printing accuracy of the light field microlens array; after printing, when unloading the substrate 5, the horizontal suction cup 112 releases the substrate 5, and then the substrate 5 on the horizontal suction cup 112 is removed to complete the unloading of the substrate 5.

[0067] Since the first guide rail 16 is arranged along the Y-axis direction on the motion platform 1, after the horizontal suction cup 112 adsorbs and fixes the substrate 5, the first sliding seat 111 is slidably connected to the first guide rail 16, which can drive the horizontal suction cup 112 and the substrate 5 to move back and forth along the Y-axis direction on the motion platform 1, thereby accurately controlling the relative position of the substrate 5 and the print head 15 in the Y-axis direction.

[0068] Since the movement of the first sliding seat 111 on the first guide rail 16 is linear and has a large movement stroke, in actual implementation, the first sliding seat 111 can be driven by a linear motor to move back and forth on the first guide rail 16, thereby driving the substrate 5 to move stably through the first sliding seat 111.

[0069] Furthermore, in this embodiment, the upper surface of the horizontal suction cup 112 is provided with an edge suction area 1121 and a center suction area 1122. When the substrate 5 is placed on the horizontal suction cup 112, the edge suction area 1121 suctions the surrounding of the substrate 5, while the center suction area 1122 suctions the middle of the substrate 5, so that the substrate 5 is more stably fixed on the horizontal suction cup 112, further ensuring the position accuracy of the substrate 5 during the printing process.

[0070] After printing is completed, the edge suction area 1121 and the center suction area 1122 on the upper surface of the horizontal suction cup 112 release the substrate 5 at the same time, thereby facilitating unloading of the substrate 5 on the horizontal suction cup 112 .

[0071] Specifically, in actual implementation, the edge adsorption area 1121 and the edge adsorption area 1121 can be negative pressure areas formed on the upper surface of the horizontal suction cup 112 by a negative pressure system. When the negative pressure system is running, the negative pressure area applies adsorption force to the substrate 5 on the upper surface of the horizontal suction cup 112; when the negative pressure system stops running, the negative pressure area no longer applies adsorption force to the substrate 5 on the upper surface of the horizontal suction cup 112.

[0072] Furthermore, in the present embodiment, a plurality of through holes 1123 are provided on the horizontal suction cup 112, and the printing device further comprises a plurality of telescopic ejector rods 113 provided in the motion platform 1, and the plurality of telescopic ejector rods 113 can extend from the plurality of through holes 1123 respectively to lift the substrate 5 off the horizontal suction cup 112. In the present embodiment, a plurality of telescopic ejector rods 113 are provided in the motion platform 1, and a plurality of through holes 1123 are provided on the horizontal suction cup 112.

[0073] When the multiple telescopic top rods 113 are in the retracted state, the multiple telescopic top rods 113 are retracted in the motion platform 1. When the multiple telescopic top rods 113 are in the extended state, the multiple telescopic top rods 113 can respectively pass through the multiple through holes 1123 and extend vertically upward on the horizontal suction cup 112.

[0074] After printing is completed, the Y-axis moving module 11 drives the horizontal suction cup 112 to move to the specified position, and the horizontal suction cup 112 loosens the substrate 5, and extends through multiple telescopic push rods 113, which respectively pass through multiple through holes 1123 and extend above the horizontal suction cup 112, pushing the substrate 5 off the upper surface of the horizontal suction cup 112 and supporting the substrate 5, thereby lifting the substrate 5 off the horizontal suction cup 112, making it easier to remove the substrate 5 on the horizontal suction cup 112 at the specified position, thereby making the use of the printing device simpler, more convenient, and more practical.

[0075] It can be foreseen that: the multiple through holes 1123 are dispersedly distributed on the horizontal suction cup 112, and the multiple telescopic push rods 113 correspond to the multiple through holes 1123 one by one, so that when the multiple telescopic push rods 113 push the substrate 5 away from the upper surface of the horizontal suction cup 112, they act on multiple positions of the substrate 5, ensuring that the force of the multiple telescopic push rods 113 is evenly distributed on the substrate 5, thereby protecting the substrate 5 and stably supporting the substrate 5.

[0076] Furthermore, in this embodiment, micro suction nozzles may be provided on the tops of the multiple telescopic push rods 113. When the multiple telescopic push rods 113 extend from the multiple through holes 1123 respectively to push the substrate 5 off the upper surface of the horizontal suction cup 112, the micro suction nozzles on the tops of the telescopic push rods 113 adsorb and fix the substrate 5, thereby ensuring the stability of the substrate 5 during the process of the multiple telescopic push rods 113 lifting the substrate 5 off the horizontal suction cup 112; when the substrate 5 is unloaded, the micro suction nozzles on the tops of the telescopic push rods 113 loosen the substrate 5, thereby ensuring smooth unloading of the substrate 5.

[0077] Specifically, in actual implementation, an electric cylinder may be provided in the motion platform 1 , and the electric cylinder may be used to drive the multiple telescopic push rods 113 to extend simultaneously and pass through the multiple through holes 1123 respectively, or to retract from the multiple through holes 1123 simultaneously.

[0078] Furthermore, in the present embodiment, the Y-axis moving module 11 further includes an auxiliary alignment component 114 disposed on the first sliding seat 111, and the auxiliary alignment component 114 is used to calibrate the position of the print head 15 in the Z-axis direction. In the present embodiment, the first sliding seat 111 is further provided with an auxiliary alignment component 114, and when adjusting the relative position of the substrate 5 and the print head 15 in the Z-axis direction, the position of the print head 15 in the Z-axis direction is calibrated by the auxiliary alignment component 114, thereby further improving the printing accuracy of the light field microlens array on the substrate 5 and ensuring product quality.

[0079] Specifically, in this embodiment, the auxiliary alignment assembly 114 includes a mounting seat 1142 fixedly connected to the first sliding seat 111, and a calibration column 1141 arranged on the mounting seat 1142, the mounting seat 1142 is used to fix the calibration column 1141 on the first sliding seat 111, and the calibration column 1141 is used to calibrate the position of the light field microlens printing needle 151 in the Z-axis direction.

[0080] In this embodiment, the auxiliary alignment assembly 114 includes a mounting seat 1142 and a calibration column 1141. The mounting seat 1142 is fixedly connected to the first sliding seat 111. The calibration column 1141 extends along the Z-axis direction on the mounting seat 1142, so that the calibration column 1141 is fixed to the first sliding seat 111 through the mounting seat 1142.

[0081] When adjusting the heights of the multiple light field microlens printing needles 151 in the Z-axis direction through the Z-axis moving module 14, the heights of the multiple light field microlens printing needles 151 can be calibrated through the calibration column 1141, so that the height adjustment of the multiple light field microlens printing needles 151 in the Z-axis direction is more precise, thereby improving the printing accuracy of the light field microlens array on the substrate 5.

[0082] In this embodiment, the printing device further includes a vision alignment component 132 disposed on the X-axis moving module 13 , and the vision alignment component 132 is used to determine the position of the substrate 5 on the Y-axis moving module 11 in the X-axis direction and the Y-axis direction.

[0083] In this embodiment, the printing device also includes a visual alignment component 132, which is arranged on the X-axis moving module 13. The position of the light field microlens printing needle 151 in the X-axis direction and the Y-axis direction is calibrated by the visual alignment component 132, thereby ensuring the accuracy of the relative position of the substrate and the light field microlens printing needle 151 in the X-axis direction and the Y-axis direction, and improving the printing accuracy of the printing device.

[0084] In this embodiment, the X-axis moving module 13 includes a second sliding seat 131, and the Z-axis moving module 14 is arranged on the second sliding seat 131. A second guide rail 121 is arranged on the gantry 12 along the X-axis direction, and the second sliding seat 131 is slidably connected with the second guide rail 121, so that the second sliding seat 131 moves back and forth along the X-axis direction on the second guide rail 121, driving the Z-axis moving module 14 and the print head 15 to move back and forth along the X-axis direction on the motion platform 1 synchronously, thereby accurately controlling the relative position of the substrate 5 and the print head 15 in the X-axis direction.

[0085] Since the second sliding seat 131 moves linearly on the second guide rail 121 and has a large movement stroke, in actual implementation, the second sliding seat 131 can be driven by a linear motor to move back and forth on the second guide rail 121, thereby driving the print head 15 to move stably through the second sliding seat 131.

[0086] In this embodiment, the Z-axis moving module 14 includes a sliding beam 141 and a connecting frame 142. A third guide rail 1311 is arranged on the second sliding seat 131 along the Z-axis direction. The sliding beam 141 is slidably connected to the third guide rail 1311. The connecting frame 142 is arranged on the sliding beam 141, and the print head 15 is arranged on the connecting frame 142. Therefore, the sliding beam 141 moves back and forth on the third guide rail 1311 along the Z-axis direction, driving the connecting frame 142 and the print head 15 to move back and forth on the motion platform 1 along the Z-axis direction, thereby accurately controlling the relative position of the substrate 5 and the print head 15 in the Z-axis direction.

[0087] In this embodiment, the relative positions of the substrate 5 and the print head 15 in the Z-axis direction are precisely controlled because after the multiple light field microlens print needles 151 extrude the printing material, the shape of the printing material is no longer controlled by the light field microlens print needles 151, and the printing material is easily affected by the external environment during the falling process, resulting in changes in the shape of the printing material and the landing point of the printing material on the substrate 5, thereby affecting the printing quality of the light field microlens array. Therefore, it is necessary to strictly control the height of the print head 15 above the substrate 5 to reduce the impact of the external environment on the printing material during the falling process.

[0088] On the other hand, different substrates 5 have different thicknesses. Therefore, in this embodiment, the Z-axis moving module 14 drives the print head 15 to move in the Z-axis direction. According to the different thicknesses of the substrate 5, the print head 15 can be placed at a specified height above the substrate 5 to print the light field microlens array on the substrate 5, thereby making the application range of the printing device wider and the practicality stronger.

[0089] Since the sliding beam 141 moves in a straight line on the third guide rail 1311 and the moving stroke of the sliding beam 141 is relatively small, in actual implementation, the third guide rail 1311 can adopt a servo rail, which drives the sliding beam 141 to move back and forth along the Z-axis direction, thereby ensuring that the sliding beam 141 drives the print head 15 to move stably and reducing the implementation cost of the printing device.

[0090] In this embodiment, the print head 15 also includes a plurality of fluid valves 152, and the plurality of fluid valves 152 are distributed in an array at the top of the connecting frame 142, and the plurality of light field microlens printing needles 151 are distributed in an array at the bottom of the connecting frame 142, so that the plurality of fluid valves 152 are located above the plurality of light field microlens printing needles 151, and the plurality of light field microlens printing needles 151 are supplied with materials respectively through the plurality of fluid valves 152.

[0091] It can be foreseen that: in this embodiment, the fluid valve 152 is connected to the air supply system and the liquid level sensor, and the printing material is driven by the air supply system to flow from the fluid valve 152 to the light field microlens printing needle 151, and is squeezed out from the light field microlens printing needle 151, so that the printing material is printed on the substrate 5 to form a light field microlens array. The liquid level sensor is used to detect the liquid level in the fluid valve 152, so as to control the air supply system to supply the fluid valve 152.

[0092] In this embodiment, the print head 15 further includes a visual observation component, which is disposed at the front side of the connecting frame 142. When the multiple light field microlens printing needles 151 print the light field microlens array on the substrate 5, the printing status of the multiple light field microlens printing needles 151 is observed by the visual observation component, so as to monitor in real time the positions of the multiple light field microlens printing needles 151 printing the light field microlens array on the substrate 5 and whether the multiple light field microlens printing needles 151 are discharging smoothly, so as to facilitate timely adjustment of the positions of the multiple light field microlens printing needles 151 and clearing of the blocked light field microlens printing needles 151, thereby ensuring the printing quality of the light field microlens array.

[0093] Specifically, in this embodiment, the visual observation assembly includes a third sliding seat 153, a ball screw 154, a mounting frame 155 and a visual observation camera 156. A fourth guide rail 1421 is provided on the front side of the connecting frame 142. The fourth guide rail 1421 extends along the X-axis direction on the connecting frame 142. The third sliding seat 153 is slidably matched with the fourth guide rail 1421. The ball screw 154 is also provided on the front side of the connecting frame 142. The mounting frame 155 is fixedly connected to the third sliding seat 153, and the visual observation camera 156 is installed on the mounting frame 155, so that the visual observation camera 156 is set on the front side of the plurality of light field microlens printing needles 151 through the mounting frame 155.

[0094] Since the observation angle of the visual observation camera 156 is limited, in the present embodiment, a light field microlens array is printed on the substrate 5 by means of a plurality of light field microlens printing needles 151 distributed in an array on the connecting frame 142. Therefore, the printing device drives the third sliding seat 153 to move back and forth along the X-axis direction on the fourth guide rail 1421 through the ball screw 154, thereby driving the mounting frame 155 and the visual observation camera 156 to move back and forth along the X-axis direction synchronously, so that the visual observation camera 156 can monitor the printing status of all light field microlens printing needles 151 in real time, thereby further ensuring the printing quality of the light field microlens array.

[0095] In this embodiment, the vision alignment assembly 132 includes a fourth sliding seat 1321 slidably connected to the second guide rail 121, a servo rail 1322 arranged on the fourth sliding seat 1321 along the Z-axis direction, a fifth sliding seat 1323 arranged on the servo rail 1322, and a vision alignment camera 1324 arranged on the fifth sliding seat 1323.

[0096] In this embodiment, the vision alignment assembly 132 includes a fourth sliding seat 1321, a servo guide rail 1322, a fifth sliding seat 1323 and a vision alignment camera 1324. The fourth sliding seat 1321 is slidably connected to the second guide rail 121. The servo guide rail 1322 is arranged on the fourth sliding seat 1321 along the Z-axis direction. The fifth sliding seat 1323 is arranged on the servo guide rail 1322. The vision alignment camera 1324 is arranged on the fifth sliding seat 1323 and moves back and forth along the X-axis direction on the second guide rail 121 through the fourth sliding seat 1321, thereby driving the servo guide rail 1322, the fifth sliding seat 1323 and the vision alignment camera 1324 to move back and forth along the X-axis direction synchronously.

[0097] The fifth sliding seat 1323 is driven to move back and forth along the Z-axis direction by the servo guide rail 1322, which drives the visual alignment camera 1324 to move back and forth along the Z-axis direction synchronously, thereby realizing automatic adjustment of the focal length of the visual alignment camera 1324, making the use of the printing device more convenient and quick. Specifically, in actual implementation, the visual alignment component 132 calibrates the position of the light field microlens printing needle 151 in the X-axis direction and the Y-axis direction, and the steps are: first, the servo guide rail 1322 is used to drive the visual alignment camera 1324 to move in the Z-axis direction, so that the visual alignment camera 1324 focuses on the substrate 5 on the motion platform 1.

[0098] Then, the fourth sliding seat 1321 moves back and forth along the X-axis direction on the second guide rail 121, driving the visual alignment camera 1324 to move along the X-axis direction, and the first sliding seat 111 moves back and forth along the Y-axis direction on the first guide rail 16, driving the substrate 5 to move along the Y-axis direction, so that the visual alignment camera 1324 grabs the preset calibration point (Mark point) on the substrate 5, and uses the calibration point (Mark point) of the substrate 5 as a reference point to establish the printing coordinate system of the X-axis and the Y-axis.

[0099] According to the coordinate point of the print head 15 in the printing coordinate system, a motion path of the print head 15 to the reference point is generated. According to the generated motion path, the first sliding seat 111 is controlled to move on the first guide rail 16, and the second sliding seat 131 is controlled to move on the second guide rail 121, so that the print head 15 moves above the reference point, thereby realizing accurate adjustment of the relative position of the substrate 5 and the print head 15 in the X-axis direction and the Y-axis direction.

[0100] Since in the present embodiment, the print head 15 includes a plurality of light field microlens print needles 151 distributed in an array, in actual implementation, according to the position of the calibration point (Mark point) of the substrate 5 in the printing area, one of the light field microlens print needles 151 can be selected as a reference object, and a motion path to a reference point is generated based on the coordinate point of the light field microlens print needle 151 in the printing coordinate system, and finally the light field microlens print needle 151 is adjusted to be directly above the reference point, so that the plurality of light field microlens print needles 151 distributed in an array are printed in the printing area of ​​the substrate 5 to form a light field microlens array.

[0101] In this embodiment, the printing device further includes a correction platform 2, a correction component 21 and a visual positioning component 22. The correction platform 2 is arranged on one side of the motion platform 1, and the correction component 21 and the visual positioning component 22 are arranged on the correction platform 2. In the previous embodiment, it is mentioned that the Y-axis moving module 11 drives the substrate 5 to move along the Y-axis direction, so that the relative position of the substrate 5 and the print head 15 in the Y-axis direction can be adjusted; the X-axis moving module 13 drives the print head 15 to move along the X-axis direction, so that the relative position of the substrate 5 and the print head 15 in the X-axis direction can be adjusted.

[0102] However, when there is an angle deviation in the substrate 5 placed on the Y-axis moving module 11, even if the relative position of the substrate 5 and the print head 15 in the Y-axis direction and the X-axis direction is guaranteed to be accurate, the light field microlens array formed by the print head 15 printing on the substrate 5 will still have a position deviation, thereby affecting product quality.

[0103] Therefore, in this embodiment, before the substrate 5 is loaded onto the motion platform 1, the substrate 5 is first transferred to the correction platform 2 for angle correction, and then the substrate 5 is transferred to the motion platform 1, and the relative position of the substrate 5 and the print head 15 in the X-axis direction, the Y-axis direction and the Z-axis direction is adjusted to further improve the printing accuracy of the light field microlens array on the substrate 5 and ensure product quality.

[0104] Specifically, when the angle of the substrate 5 is corrected on the correction platform 2, the substrate 5 is first placed on the correction component 21, and the substrate 5 is positioned and identified by the visual positioning component 22. At the same time, the visual positioning component 22 transmits the position information of the grasped substrate 5 to the control system, and the control system processes the position information of the substrate 5 and analyzes the angle deviation of the substrate 5.

[0105] According to the analyzed angle deviation of the substrate 5, the control system controls the operation of the correction component 21, so as to correct the angle of the substrate 5 through the correction component 21, and then transfers the substrate 5 on the correction component 21 to the Y-axis moving module 11 of the motion platform 1, so as to ensure the angle accuracy of the substrate 5 on the Y-axis moving module 11.

[0106] It can be foreseen that: in this embodiment, the printing device also includes a transfer mechanism 4 that translates the substrate 5 on the correction platform 2 to the moving platform 1. After the angle of the substrate 5 is corrected on the correction platform 2, the transfer mechanism 4 translates the substrate 5 on the correction platform 2 to a specified position on the moving platform 1, and ensures that the angle of the substrate 5 will not be offset during the transfer process, thereby ensuring the angle accuracy of the substrate 5 on the moving platform 1, thereby improving the printing accuracy of the light field microlens array on the substrate 5 and ensuring product quality.

[0107] In this embodiment, the visual positioning assembly 22 includes a support frame 221, a connecting beam 222 and a visual positioning module. The support frame 221 extends along the X-axis direction on the correction platform 2, the connecting beam 222 extends along the Y-axis direction on the support frame 221, and the connecting beam 222 can move back and forth axially on the support frame 221. The visual positioning module is arranged on the connecting beam 222, and the visual positioning module can move back and forth axially on the connecting beam 222.

[0108] The connecting beam 222 moves back and forth axially on the support frame 221, driving the visual positioning module to move back and forth along the X-axis direction, so that the visual positioning module can locate and identify multiple positioning identification points set along the X-axis direction on the substrate 5 at different positions in the X-axis direction.

[0109] By moving the visual positioning module back and forth axially on the connecting beam 222, the visual positioning module can locate and identify multiple positioning identification points set along the Y-axis direction on the substrate 5 at different positions in the Y-axis direction, thereby ensuring the accuracy of the visual positioning module in identifying the angle of the substrate 5 and further ensuring the angle precision of the substrate 5.

[0110] Specifically, in this embodiment, the support frame 221 is axially provided with a fifth guide rail 2211, and the connecting beam 222 is slidably connected to the fifth guide rail 2211, so that the support frame 221 moves back and forth along the fifth guide rail 2211 through the connecting beam 222, driving the visual positioning module to move back and forth along the X-axis direction.

[0111] The visual positioning module includes a sixth sliding seat 223 and a visual recognition camera 224. A sixth guide rail 2221 is axially arranged on the connecting beam 222. The sixth sliding seat 223 is slidably connected to the sixth guide rail 2221. The visual recognition camera 224 is arranged on the sixth sliding seat 223, so that the sixth sliding seat 223 moves back and forth along the sixth guide rail 2221 on the connecting beam 222, driving the visual recognition camera 224 to move back and forth along the Y-axis direction, thereby enabling the visual recognition camera 224 to grasp the preset positioning recognition point on the substrate 5 at different positions in the X-axis direction and the Y-axis direction.

[0112] The visual recognition camera 224 transmits the captured positioning identification point information to the control system, and the control system processes the positioning identification point information and analyzes the angle deviation of the substrate 5. Based on the analyzed angle deviation of the substrate 5, the control system controls the correction component 21 to operate and perform angle correction on the substrate 5.

[0113] Since the movement of the connecting beam 222 on the fifth guide rail 2211 and the movement of the sixth sliding seat 223 on the sixth guide rail 2221 are both linear movements, and the movement is relatively large, in actual implementation, a linear motor can be used as a power source for the movement of the connecting beam 222 on the fifth guide rail 2211 and the movement of the sixth sliding seat 223 on the sixth guide rail 2221, thereby ensuring that the visual recognition camera 224 moves stably in the X-axis direction and the Y-axis direction, thereby ensuring the accuracy of the visual recognition camera 224 in identifying the position of the substrate 5.

[0114] In this embodiment, the deviation correction component 21 includes a rotating seat 211 and a material receiving platform 212. The rotating seat 211 is arranged on the deviation correction platform 2, and the material receiving platform 212 is arranged on the rotating seat 211. Specifically, the rotating seat 211 includes a DD motor, and the material receiving platform 212 can be driven by the DD motor to rotate at a specified angle.

[0115] When correcting the angle of the substrate 5, the substrate 5 is placed on the material receiving platform 212. After the control system analyzes the angle deviation of the substrate 5 based on the positioning identification point information transmitted by the visual recognition camera 224, the control system controls the rotating seat 211 to rotate a certain angle, thereby driving the material receiving platform 212 and the substrate 5 to rotate, thereby achieving the angle correction of the substrate 5.

[0116] Specifically, in actual implementation, the transfer mechanism 4 can be a robot that moves back and forth between the correction platform 2 and the motion platform 1. The robot grabs the substrate 5 on the docking platform 212, and then moves the robot toward the motion platform 1 to place the substrate 5 on the horizontal suction cup 112 of the motion platform 1, thereby ensuring that the substrate 5 does not produce angular deflection.

[0117] Due to the high optical requirements of light field microlenses, the thickness and uniformity of microlenses need to be strictly controlled. Changes in ambient temperature, working environment cleanliness, pressure, moisture content in the air, solvent volatilization, etc. will cause changes in the height and uniformity of microlenses. For example: changes in ambient temperature cause changes in material viscosity, particles in the air fall on the substrate 5 causing the microlens to fail to print, and air level content causes changes in morphology.

[0118] Therefore, in this embodiment, the printing device further includes a temperature control box 3, and the motion platform 1, the correction platform 2, and the transfer mechanism 4 are all arranged in the temperature control box 3, so that the printing device performs the printing process of the light field microlens array on the substrate 5 in the temperature control box 3. The temperature control box 3 provides a working environment with constant temperature and pressure, high environmental cleanliness, and low moisture content, thereby ensuring the printing quality of the light field microlens array.

[0119] Specifically, in actual implementation, the temperature control box 3 includes a box body 31, a purification system 32, a temperature control system 33 and a feeding gate valve 34. The purification system 32 is connected to the box body 31, so that the environmental cleanliness of the internal space of the box body 31 and the moisture content of the internal space of the box body 31 are ensured by the purification system 32. In this embodiment, it is preferred that the box body 31 meets the calss10 cleanliness level, and the moisture content is maintained at 100 ppm (parts per million concentration).

[0120] The temperature control system 33 is connected to the box 31, so that the temperature of the inner space of the box 31 is controlled by the temperature control system 33. In this embodiment, according to the material characteristics, the temperature in the box 31 can be set between 23-30°C, and the temperature control system 33 controls the temperature change of the inner space of the box 31 to be between ±0.5°C.

[0121] The feeding gate valve 34 is disposed on the box body 31, and the printing material can be delivered to the print head 15 in the box body 31 through the feeding gate valve 34 for printing the light field microlens array. It can be foreseen that: in this embodiment, the feeding gate valve 34 needs to have good sealing performance to ensure that the working environment of the internal space of the box body 31 is not disturbed by the external environment.

[0122] In an embodiment of the present invention, a printing method for a light field microlens array is also provided, comprising the following steps: first obtaining position information of a substrate 5, and then adjusting the angle of the substrate 5 according to the position information; then calibrating the printing height of the substrate 5, and adjusting the position of the print head 15 in the Z-axis direction according to the calibrated printing height; finally, calibrating the printing position of the substrate 5, and adjusting the relative position of the print head 15 and the substrate 5 in the X-axis direction and the Y-axis direction according to the calibrated printing position, so that the print head 15 prints on the substrate 5 to form a light field microlens array.

[0123] The printing method obtains the position information of the substrate 5, adjusts the angle of the substrate 5, and calibrates the printing height and printing position of the substrate 5 to control the accuracy of the relative position of the print head 15 and the substrate 5 in the X-axis direction, the Y-axis direction, and the Z-axis direction, thereby improving the printing accuracy of the light field microlens array on the substrate and ensuring product quality.

[0124] Specifically, in the present printing method, the position information of the substrate 5 is obtained, and the angle of the substrate 5 is adjusted according to the position information, including the following steps: first, the substrate 5 is transported to the correction component 21 on the correction platform 2, and the visual positioning component 22 obtains the current image information to determine the position information of the edge and corner points of the substrate 5, and based on the position information, it is determined whether the substrate 5 is located at a preset position; if not, an angle adjustment instruction is generated to control the rotation of the correction component 21 to correct the angle of the substrate 5, thereby adjusting the angle of the substrate 5.

[0125] Specifically, in the present printing method, the printing height of the substrate 5 is calibrated, and the position of the print head 15 in the Z-axis direction is adjusted according to the calibrated printing height, including the following steps: first, the relative distance a between the calibration column 1141 and the distance sensor is measured by the distance sensor located on the X-axis moving module 13; then, the X-axis moving module 13 and the Y-axis moving module 11 are moved so that the print head 15 is located directly above the calibration column 1141; then, the Z-axis moving module 14 is used to drive the print head 15 to lower its height until the print head 15 contacts the calibration column 1141 (the calibration column 1141 is a micro-motion sensor, and there will be a feedback signal after the print head 15 contacts it); then, the distance sensor located on the X-axis moving module 13 is used to measure the relative distance b between the substrate 5 and the distance sensor, and the relative distance between the current print head 15 and the substrate 5 can be obtained through the numerical difference between a and b.

[0126] According to the current relative distance between the print head 15 and the substrate 5, and the target distance between the print head 15 and the substrate 5, the distance that the Z-axis moving module 14 needs to drive the print head 15 to move can be obtained; finally, according to the obtained data, the Z-axis moving module 14 is controlled to drive the print head 15 to move a corresponding distance, so that the distance between the print head 15 and the substrate 5 is the target distance, and the position adjustment of the print head 15 in the Z-axis direction is completed.

[0127] Generally, the relative distance between the current print head 15 and the substrate 5 is directly measured by a distance measuring sensor. However, when multiple groups of X-axis moving modules 13 are arranged on the gantry 12, each group of X-axis moving modules 13 needs to be equipped with a distance measuring sensor, which is costly.

[0128] In the present printing method, the print head 15 is calibrated by setting a calibration column 1141 on the Y-axis moving module 11, so that the distance measuring sensor can obtain the current relative distance between the print head 15 and the substrate 5 by measuring the relative distance between the distance measuring sensor and the substrate 5 and the relative distance between the distance measuring sensor and the calibration column 1141. Therefore, when multiple sets of X-axis moving modules 13 are set on the gantry 12, only one distance measuring sensor is needed to realize the measurement of the relative distance between the current print head 15 and the substrate 5 on multiple sets of X-axis moving modules 13, thereby greatly reducing the production cost.

[0129] Specifically, in the present printing method, the printing position of the substrate 5 is calibrated, which includes the following steps: first, the vision alignment camera 1324 is driven to move in the Z-axis direction by the servo guide rail 1322, so that the vision alignment camera 1324 focuses on the substrate 5 on the motion platform 1; then, the fourth sliding seat 1321 moves back and forth along the X-axis direction on the second guide rail 121, driving the vision alignment camera 1324 to move along the X-axis direction, and the first sliding seat 111 moves back and forth along the Y-axis direction on the first guide rail 16, driving the substrate 5 to move along the Y-axis direction, so that the vision alignment camera 1324 grabs the preset calibration point (Mark point) on the substrate 5, and the vision alignment camera 1324 transmits the grabbed information to the control system. After the control system processes the information, it uses the calibration point (Mark point) of the substrate 5 as the reference point to establish the printing coordinate system of the X-axis and the Y-axis.

[0130] Specifically, in the present printing method, the relative position of the print head 15 and the substrate 5 in the X-axis direction and the Y-axis direction is adjusted according to the calibrated printing position, including the following steps: the visual alignment camera 1324 transmits the captured information to the control system, and after the printing coordinate system of the X-axis and the Y-axis is established, the visual alignment camera 1324 is moved away; based on the coordinate point of the print head 15 in the printing coordinate system, a motion path of the print head 15 to the reference point is generated.

[0131] According to the generated motion path, the control system controls the X-axis moving module 13 to move along the X-axis direction on the gantry 12, and at the same time controls the Y-axis moving module 11 to move along the Y-axis direction on the motion platform 1, so that the print head 15 moves above the reference point, and the relative position adjustment of the print head 15 and the substrate 5 in the X-axis direction and the Y-axis direction is completed.

[0132] In the previous embodiment, it is mentioned that a plurality of groups of X-axis moving modules 13 are arranged on the gantry 12 of the printing device, and each group of X-axis moving modules 13 has a group of Z-axis moving modules 14 and a print head 15, which are respectively used for printing the multi-layer light field lens material of the light field microlens array. Specifically, taking the printing of three layers of light field lens material as an example, three groups of X-axis moving modules 13 are arranged on the gantry 12, and each of the three groups of X-axis moving modules 13 has a group of Z-axis moving modules 14 and a print head 15.

[0133] In the present printing method, after the relative adjustment of the substrate 5 and the print head 15 in the Y-axis direction is completed, the first group of X-axis moving modules 13 drives the first group of Z-axis moving modules 14 and the first group of print heads 15 thereon to move, and adjusts the relative position of the first group of print heads 15 and the substrate 5 in the X-axis direction, so that the first group of print heads 15 are aligned with the preset printing area on the substrate 5; and then the first group of Z-axis moving modules 14 adjusts the relative position of the first group of print heads 15 and the substrate 5 in the Z-axis direction, so that the first group of print heads 15 prints the first layer of printed light field lens material on the substrate 5 at a specified height.

[0134] Then, the first group of X-axis moving modules 13 drives the first group of Z-axis moving modules 14 and the first group of print heads 15 to move, so that the first group of print heads 15 move away from the preset printing area on the substrate 5; repeat the above steps, and print the second layer of light field lens material by the second group of print heads 15, and print the third layer of light field lens material by the third group of print heads 15, so as to form a light field microlens array on the substrate 5.

[0135] Through this method, on the one hand, when printing a light field microlens array, it is not necessary to replace the light field lens material in the print head 15, so as to realize the printing of the light field microlens array, thereby improving the printing efficiency of the light field microlens array and further improving the production efficiency; on the other hand, it is possible to prevent the residual light field lens material in the print head 15 from mixing with the light field lens material of other layers and affecting the characteristics of the light field lens material, thereby ensuring the printing quality of the light field microlens array and further ensuring the product quality.

[0136] The contents described above may be implemented individually or in combination in various ways, and these variations are all within the protection scope of the present invention.

[0137] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements.

[0138] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A printing device for a light field microlens array, characterized in that: The invention comprises a motion platform (1), a Y-axis moving module (11) arranged on the motion platform (1), a gantry (12) arranged on the motion platform (1), an X-axis moving module (13) arranged on the gantry (12), a Z-axis moving module (14) arranged on the X-axis moving module (13), and a print head (15) arranged on the Z-axis moving module (14); a substrate (5) is arranged on the Y-axis moving module (11); the print head (15) comprises a plurality of light field micro-lenses arranged in an array on the Z-axis moving module (14); A printing needle head (151), wherein a plurality of the light field microlens printing needle heads (151) extrude the light field lens material to print on the substrate (5) to form a light field microlens array, the Y-axis moving module (11) moves back and forth along the Y-axis direction on the moving platform (1), the gantry (12) extends along the X-axis direction on the moving platform (1), the X-axis moving module (13) moves back and forth along the axial direction on the gantry (12), and the Z-axis moving module (14) moves back and forth along the Z-axis direction on the X-axis moving module (13); A first guide rail (16) is arranged on the motion platform (1) along the Y-axis direction, and the Y-axis moving module (11) comprises a first sliding seat (111) slidably connected to the first guide rail (16), and the first sliding seat (111) can move back and forth on the first guide rail (16) along the Y-axis direction; The Y-axis moving module (11) further comprises an auxiliary alignment component (114) disposed on the first sliding seat (111), the auxiliary alignment component (114) being used to calibrate the position of the light field microlens printing needle (151) in the Z-axis direction; The auxiliary alignment component (114) comprises a mounting seat (1142) fixedly connected to the first sliding seat (111), and a calibration column (1141) provided on the mounting seat (1142), the mounting seat (1142) being used to fix the calibration column (1141) on the first sliding seat (111), and the calibration column (1141) being used to calibrate the position of the light field microlens printing needle (151) in the Z-axis direction.

2. A light field microlens array printing device as claimed in claim 1, characterized in that: The Y-axis moving module (11) further comprises a horizontal suction cup (112) arranged on the first sliding seat (111), the substrate (5) is arranged on the horizontal suction cup (112), and the horizontal suction cup (112) is used to absorb or release the substrate (5).

3. A light field microlens array printing device as claimed in claim 2, characterized in that: An edge adsorption area (1121) and a center adsorption area (1122) are distributed on the upper surface of the horizontal suction cup (112), wherein the edge adsorption area (1121) is used to adsorb the periphery of the substrate (5), and the center adsorption area (1122) is used to adsorb the middle of the substrate (5).

4. A light field microlens array printing device as claimed in claim 2, characterized in that: The horizontal suction cup (112) is provided with a plurality of through holes (1123), and the printing device further comprises a plurality of telescopic push rods (113) arranged in the motion platform (1), and the plurality of telescopic push rods (113) can be respectively extended from the plurality of through holes (1123) to lift the substrate (5) away from the horizontal suction cup (112).

5. A light field microlens array printing device as claimed in claim 1, characterized in that: The printing device further comprises a visual alignment component (132) arranged on the X-axis moving module (13), wherein the visual alignment component (132) is used to calibrate the position of the light field microlens printing needle (151) in the X-axis direction and the Y-axis direction.

6. A light field microlens array printing device as claimed in claim 5, characterized in that: A second guide rail (121) is provided on the gantry (12) along the X-axis direction; the X-axis moving module (13) comprises a second sliding seat (131) slidably connected to the second guide rail (121); the second sliding seat (131) can move back and forth along the X-axis direction on the second guide rail (121); and the Z-axis moving module (14) is provided on the second sliding seat (131).

7. A light field microlens array printing device as claimed in claim 6, characterized in that: A third guide rail (1311) is arranged on the second sliding seat (131) along the Z-axis direction. The Z-axis moving module (14) includes a sliding beam (141) slidably connected to the third guide rail (1311), and a connecting frame (142) arranged on the sliding beam (141). The sliding beam (141) can move back and forth along the Z-axis direction on the third guide rail (1311). The print head (15) is arranged on the connecting frame (142).

8. A light field microlens array printing device as claimed in claim 7, characterized in that: The print head (15) further comprises a plurality of fluid valves (152) arranged on the top of the connecting frame (142); the plurality of light field microlens printing needles (151) are distributed in an array at the bottom of the connecting frame (142); and the plurality of fluid valves (152) are distributed in an array at the top of the connecting frame (142) for respectively supplying materials to the plurality of light field microlens printing needles (151).

9. A light field microlens array printing device as claimed in claim 7, characterized in that: The print head (15) further comprises a visual observation component arranged on the front side of the connecting frame (142), wherein the visual observation component is used to observe the printing status of the plurality of light field microlens printing needles (151).

10. A light field microlens array printing device as claimed in claim 9, characterized in that: A fourth guide rail (1421) is provided on the front side of the connecting frame (142) along the X-axis direction. The visual observation component comprises a third sliding seat (153) slidably matched with the fourth guide rail (1421), a ball screw (154) provided on the front side of the connecting frame (142), a mounting frame (155) provided on the third sliding seat (153), and a visual observation camera (156) provided on the mounting frame (155). The ball screw (154) is used to drive the third sliding seat (153) to move back and forth on the fourth guide rail (1421) along the X-axis direction. The mounting frame (155) is used to mount the visual observation camera (156) on the front side of the plurality of light field microlens printing needles (151). The visual observation camera (156) is used to observe the printing status of the plurality of light field microlens printing needles (151).

11. A light field microlens array printing device as claimed in claim 6, characterized in that: The visual alignment component (132) includes a fourth sliding seat (1321) slidably connected to the second guide rail (121), a servo rail (1322) arranged on the fourth sliding seat (1321) along the Z-axis direction, a fifth sliding seat (1323) arranged on the servo rail (1322), and a visual alignment camera (1324) arranged on the fifth sliding seat (1323).

12. A light field microlens array printing device as claimed in claim 1, characterized in that: The printing device further comprises a deflection correction platform (2) arranged on one side of the moving platform (1), a deflection correction component (21) arranged on the deflection correction platform (2), and a visual positioning component (22) arranged on the deflection correction platform (2), wherein the visual positioning component (22) is used to position and identify a substrate (5) on the deflection correction component (21), and the deflection correction component (21) is used to correct the deflection of the substrate (5), and the substrate (5) is transferred from the deflection correction platform (2) to the moving platform (1).

13. A light field microlens array printing device as claimed in claim 12, characterized in that: The visual positioning component (22) comprises a support frame (221) arranged on the deviation correction platform (2), a connecting beam (222) arranged on the support frame (221), and a visual positioning module arranged on the connecting beam (222), wherein the support frame (221) extends along the X-axis direction on the deviation correction platform (2), the connecting beam (222) extends along the Y-axis direction on the support frame (221), and can move back and forth along the axial direction on the support frame (221), and the visual positioning module can move back and forth along the Y-axis direction on the connecting beam (222) for positioning and identifying the substrate (5) on the deviation correction component (21).

14. A light field microlens array printing device as claimed in claim 13, characterized in that: The support frame (221) is axially provided with a fifth guide rail (2211), the connecting beam (222) is slidably connected to the fifth guide rail (2211), a sixth guide rail (2221) is axially provided on the connecting beam (222), and the visual positioning module comprises a sixth sliding seat (223) slidably connected to the sixth guide rail (2221), and a visual recognition camera (224) arranged on the sixth sliding seat (223).

15. A light field microlens array printing device as claimed in claim 12, characterized in that: The deflection correction component (21) comprises a rotating seat (211) disposed on the deflection correction platform (2), and a material receiving platform (212) disposed on the rotating seat (211); the material receiving platform (212) is used to receive the substrate (5), and the rotating seat (211) is used to drive the material receiving platform (212) to rotate.

16. A printing method for a light field microlens array printing device according to any one of claims 1 to 15, characterized in that: The following steps are involved: Acquiring position information of the substrate (5), and adjusting the angle of the substrate (5) according to the position information; Calibrate the printing height of the substrate (5), and adjust the position of the print head (15) in the Z-axis direction according to the calibrated printing height; The printing position of the substrate (5) is calibrated, and the relative position of the print head (15) and the substrate (5) in the X-axis direction and the Y-axis direction is adjusted according to the calibrated printing position, so that the print head (15) prints on the substrate (5) to form a light field microlens array.

17. A printing method for a light field microlens array printing device as claimed in claim 16, characterized in that: Calibrate the printing height of the substrate (5), and adjust the position of the print head (15) in the Z-axis direction according to the calibrated printing height, comprising the following steps: The print head (15) is driven to move by the X-axis moving module (13), the Y-axis moving module (11) and the Z-axis moving module (14), so that the print head (15) contacts the calibration column (1141); Measuring the relative height distance between the calibration column (1141) and the substrate (5) by means of a height sensor to obtain the relative height distance between the current print head (15) and the substrate (5); According to the current relative height distance between the print head (15) and the substrate (5), and the target height distance between the print head (15) and the substrate (5), the distance data that the Z-axis moving module (14) needs to drive the print head (15) to move is obtained; According to the acquired data, the Z-axis moving module (14) is controlled to drive the print head (15) to move a corresponding distance.

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