Fabrication Process Of Microlens Array Based On Electrojet Printing

Microlens and microlens arrays have irreplaceable application value and broad application prospects in many devices and devices.However;the current process steps for preparing microlens arrays are complicated,and the processing equipment is expensive,so the cost is low-cost and efficient.Microlens array is still the key point to be solved.This paper uses electrojet printing technology,making microlens array mold with glycerin aqueous solution as spray material.Based on this,a microlens array was prepared.The main work is as follows:Firstly,the current status of micro-lens manufacturing technology and electro-printing technology at home and abroad are discussed.The commonly used micro-transparent manufacturing technology is introduced.The characteristics and development status of electro-printing technology are expounded.A new method of microlens array technology,and a brief description of the parts studied in each chapter of this paper.Secondly,the characteristics and basic theory of electrojet printing are studied,the printing law of electrojet printing under high voltage pulse is analyzed.And the influence of pulse voltage and bias voltage on ejection is derived,which provides a theoretical basis for electrospray microdrop arrays.Glycerin was selected as the electro-printing material,and an electro-printing experimental platform was set up to make the glycerin droplet array positive mold,and the experimental scheme and steps for preparing the glycerol droplet array were proposed.Then,the experimental study on the electrospray process parameters for the glycerol aqueous solution ejection stability,determined the process range of the stable printing of selected glycerol aqueous solution;for the instability of the droplets in the nozzle of electrojet printing,It is proposed to use computer vision to detect the state of droplets at the nozzle,optimizing the electro-printing process.The process parameters such as voltage magnitude,pulse frequency,inner diameter of the nozzle and the distance between the nozzle and the collecting plate were studied experimentally.The analysis and measurement of the morphology and diameter of the printed droplets were used to summarize the electro-printing regular glycerol droplet array.Explore the best combination of process parameters by designing orthogonal experiments.The average diameter of the droplets in the final array of glycerol aqueous droplets was 28.5?m with a standard deviation of 0.7.Finally,a new method for fabricating microlens arrays based on electrojet printing is proposed.The wettability and adhesion of glycerin aqueous solution on the conductive glass collecting plate were studied experimentally.The process optimization method was proposed for the defect of microlens.The positional accuracy of the glycerol droplet array was analyzed during the PDMS casting process.By comparing the spacing of PDMS die pits and the spacing of glycerol droplet array droplets,the experimental detection of microlens arrays mainly includes geometrical properties and optical properties.The microlens arrays have good optical consistency,which confirms the effectiveness of the new process proposed in this paper.