Research On Liquid Zoom Lens With Piezoelectric Driving

With the development of modern optics and micro-elecromechanical systems,sophisticated optical manufacture and contemporary industrial equipment have a higher demand for the precision and image quality of zoom lens.This demand is too harsh to perform for traditional mechanical zoom lens.The micro-optical liquid zoom lens which was developed in the near future supply a feasible access to solve present problem.It has the characteristics of miniaturization and micromation and adopt liquid as their euphotic medium.Liquid zoom lens change its focal length by micro-fluidics technology to control and change the geometrical shape or the refractive index of the liquid. Researchers used to adopt deionized water or inorganic salt equeous solution as filling liquid of the zoom lens most of the time. Due to disadvantage of effumability of water and poor thermal stability under natural conditions. Otherwise, water has a narrow working temperature, It become very pressing for the development of liquid zoom lens to find a new kind of liquid lens medium who can overcome above problems. As a new green environmental protection material,the ionic liquid own some merits compared with other organic solvent such as incombustibility large heat capacity excellent thermal stability wide rang of liquid high conductivity wider electrochemical window stable nature small vapor pressure avirulent environmental protection and so on. Our research mainly contains several aspects as below:1.We use the ionic liquid as our liquid lens medium and analyze the change contact angle of ionic liquid lens with different volume and research the influence of different dosage and geometrical parameters and insulation layer thickness. We explore the regular of response time of ionic liquid with different density and surface tension and the contact angle of ionic liquid contact with Substrate Layer. We study the influence for liquid zoom lenses of different surface tension, type and dosage of ionic liquid. Find the law by contrast with the experimental result of deionized water. Finally,supply some basis data on the application and performance optimization for the application of liquid zoom lenses.2.On the basic of existing driving method and mechanical structure of liquid lenses,come up with a new single vibrator piezoelectric drive ionic liquid focal change lens which has a compact structure a wide range of liquid and a large zoom range. According to piezoelectric vibration theory,we investigate the harmonic frequency and oscillatory displacement of vibrator with different structure.We adopt finite element analysis method software(FEM)analyze the statics and modal to our liquid zoom lens. According to the test of harmonic frequency and oscillatory displacement,we obtain the largest vibration energy when the single vibrator lens work in the radial harmonic frequency.that is conducive to the formation of a bigger radius of curvature.3.In view of the single vibrator piezoelectric driving, to achieving the bigger vibration displacement,according to the theory of transducer,single vibrator has been optimized as the composite transducer.We explore three sandwich vibrator constructs which is similar with piezoelectric ultrasonic transducer structure based on the theory of Piezoelectric vibration.We utilize FEM to simulate the regulation of the resonance frequency of liquid lenses system with different vibrator parameters.The use of ionic liquid can avoid the evaporation and adapted to a large range of liquid.By contrast with the traditional inorganic salt aqueous solution,stress the merit of the using in high temperature. According to the size and direction of the piezoelectric ceramics with different direction of polarization, obtain the influence of the liquid lens with different materials structure and dimension.Aim to the practical application,supply a available solution for the use of relatively low or high temperature.The above regulation and test supply some theoretical gist and reference for the application of ultrasonic technology in liquid zoom lens.