Design of Defocus Compensate Mechanism Based on Liquid Lens

To decrease the influence of defocus on liquid crystal adaptive optics system,improve the imaging quality,a mechanism for defocus compensate has been designed.The mechanism was based on liquid lens,which can change the focal length continuously without any moving part.In order to design the adjust mechanism reasonably,calculation have been taken on the relationship between the rotation angle of the outer ring and the deflection of film center.Then 0.2 diopter is choosen as the division value.The parameters of the mechanism were based on relationship between the rotation angle of the outer ring with deflection of film center and the division value.It shows a good performance in liquid crystal adaptive optics system.